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Math problem i need the solution 1.a car travel 845 km in 2 hours what was its average speed?

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I also got 422.5km/h..

how i got it...formula is

AVE SPEED = TOTAL DISTANCE / TOTAL TIME

Posted on Sep 10, 2009

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422.5 Km./Hr.

Posted on Nov 27, 2008


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Give some example of math equation?


The following are examples of expressions:
2
x
3 + 7
2 × y + 5
2 + 6 × (4 - 2)
z + 3 × (8 - z)
Example:
Roland weighs 70 kilograms, and Mark weighs k kilograms. Write an expression for their combined weight. The combined weight in kilograms of these two people is the sum of their weights, which is 70 + k.
Example:
A car travels down the freeway at 55 kilometers per hour. Write an expression for the distance the car will have traveled after h hours. Distance equals rate times time, so the distance traveled is equal to 55 × h..
Example:
There are 2000 liters of water in a swimming pool. Water is filling the pool at the rate of 100 liters per minute. Write an expression for the amount of water, in liters, in the swimming pool after m minutes. The amount of water added to the pool after m minutes will be 100 liters per minute times m, or 100 × m. Since we started with 2000 liters of water in the pool, we add this to the amount of water added to the pool to get the expression 100 × m + 2000.
To evaluate an expression at some number means we replace a variable in an expression with the number, and simplify the expression.
Example:
Evaluate the expression 4 × z + 12 when z = 15.
We replace each occurrence of z with the number 15, and simplify using the usual rules: parentheses first, then exponents, multiplication and division, then addition and subtraction.
4 × z + 12 becomes
4 × 15 + 12 =
60 + 12 =
72
Example:
Evaluate the expression (1 + z) × 2 + 12 ÷ 3 - z when z = 4.
We replace each occurrence of z with the number 4, and simplify using the usual rules: parentheses first, then exponents, multiplication and division, then addition and subtraction.
(1 + z) × 2 + 12 ÷ 3 - z becomes
(1 + 4) × 2 + 12 ÷ 3 - 4 =
5 × 2 + 12 ÷ 3 - 4 =
10 + 4 - 4 =
10.

hope that help you

Jun 22, 2011 | LeapFrog Turbo Twist Math Cartridge 5th...

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Ben travel 126 km in 21/2 hours. how many kilometers did ben travel iafter 3 hours


126km/21.5hr = 5.86km/hr This is how far he travels each hour.

Once you find this out you multiply by 3 hours because you want to know how many kilometers he traveled in 3 hours not each hour. 3 * 5.86= 35.16 km.
Ben traveled 35.16 Kilometers after 3 hours.

Jun 09, 2011 | Sharp EL-2630P Calculator

1 Answer

One train leaves a station heading west, while another leaves two hours later travelling 15km/h faster heading east. After 6 hours the trains are 580 km apart. How fast is each train travelling?


To start out, you need to figure out what the equation for the problem is. You know a few things that should help you along the way:
  • The trains are 580 km apart
  • one train traveled for 6 hours
  • the other train traveled for 4 hours
  • one train is going 15km/h faster than the other.
Knowing these facts you can write the equation 6x+4x+60=580.

The 6 at the front is how many hours the first train traveled. the 4 is the hours the second train traveled. the 60 is (4*15) which is how much faster the second train was going. the 580 is the total distance between them.

Solve for x

10x=520
x=52

So the westbound train was going 52 km/h and the east bound train was going 67km/h.

May 03, 2011 | Texas Instruments TI-30 XIIS Calculator

1 Answer

Ms. Driva Reck drove from her home to the service station at 48 km/h. She returned home by bicycle at 16 km/h. The entire trip took 4 hours. How far was the service station from Ms. Reck's home?


Ms. Reck's trip on her bike took 3 times longer (48/16ths) so the service station was 48 km from her home. It took her one hour (1x48km)= 48km) to get there and 3 hours to get home (3x16=48km) for a total of 4 hours...

Nov 22, 2009 | The Learning Company Achieve! Math &...

2 Answers

What are the numbers on face plate for(likes 60,65,....900,1000)?


The ones associated with the little circles? One dial is for seconds, one for minutes, and one for hours. The seconds one should be applicable for time. The minute and hour, along with the big seconds hand that is centre mounted are for the chronograph function.

Jan 23, 2009 | Tissot PRS 200 Wrist Watch

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