Time and Distance: Problem Two

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beshtesh: Newbie | Next Rank: 10 Posts; Posts: 5; Joined: Thu Jun 08, 2006 12:25 am

by beshtesh » Sat Oct 11, 2008 8:35 am

Can anyone solve this problem for me?

The driver of a car driving at the speed of 68 Km/hr locates a bus 40 metres ahead of him. After 10 seconds, the bus is 60 metres behind. The speed of the bus is:

A. 30 km/hr

B. 32 km/hr

C. 25 km/hr

D. 38 km/hr

E. 6.8 km/hr

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Source: Beat The GMAT — Problem Solving | Sat Oct 11, 2008 8:35 am

boatracers: Junior | Next Rank: 30 Posts; Posts: 25; Joined: Mon Sep 29, 2008 11:31 pm; Location: California; Thanked: 3 times

by boatracers » Sat Oct 11, 2008 12:33 pm

i haven't done these in a while, but i believe it should be "b"

Paul
[email protected]
www.EssayMatch.com

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gergely: Newbie | Next Rank: 10 Posts; Posts: 1; Joined: Mon Oct 13, 2008 12:16 pm

by gergely » Mon Oct 13, 2008 12:41 pm

speed is a distance covered over a period of time. here, the speed difference between car and bus is 40+60=100m per 10 seconds. that is 600m per minute, or 36,000m per hour, ie 36km/h. so the speed of the bus is 68-36=32km/h and B should be the correct answer

Gergely

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