Question about Vivendi Excel@ Mathematics Study Skills (71101) for PC, Mac
Posted on Mar 03, 2011
Let X be the time taken when train is moving in its normal speed.
Y be the normal speed of the train.
Speed = distance/time
that is X = 400 / Y
or Y = 400 / X --------- (1)
When speed is decreased by 5 km/hr time increases by 4 hour
that is X + 4 = 400 / Y -5
= X + 4 = 400 X / 400 - 5X ( substitute Y = 400 /X we get this equation)
on solving we get 5X^2 + 20x - 1600 = 0
we get two solutions X = 16 and -20
-20 is neglected (time cannot be negative)
substitute X in equation (1)
Y = 400 / 16 = 25 km/hr
So normal speed of train is 25 km/hr.
Posted on Jun 02, 2010
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Jul 02, 2014 | Casio FX-115ES Scientific Calculator
May 12, 2014 | Google Finance
May 05, 2014 | Office Equipment & Supplies
Aug 24, 2013 | Office Equipment & Supplies
Jun 18, 2013 | Wildlife Research Health & Beauty
Aug 08, 2011 | Texas Instruments TI-84 Plus Calculator
Jul 03, 2011 | 2011 Audi A5
Sep 19, 2010 | Vivendi Excel@ Mathematics Study Skills...
122 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: