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# The time it took car A to travel 400 miles was 2 hours less

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Intern
Joined: 15 Apr 2005
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Location: Fairfax, VA
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The time it took car A to travel 400 miles was 2 hours less [#permalink]  13 May 2005, 11:22
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The time it took car A to travel 400 miles was 2 hours less than the time it took car B to travel the same distance. If car A's average speed was 10 miles per hour greater than that of car B, what was car B's average speed, in miles per hour?

a) 20
b) 30
c) 40
d) 50
e) 80
Manager
Joined: 05 May 2005
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Location: Kyiv, Ukraine
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or you can find it through time.

40/(t-2)=10+40/t

t=10 and average speed 400/10=40
Intern
Joined: 15 Apr 2005
Posts: 15
Location: Fairfax, VA
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Sorry, could I get some step by step explanations of these answers? I know the formula is:

Distance=Rate * Time

But I can't seem to see how you guys came up with your equations.
Thanks!
Manager
Joined: 05 May 2005
Posts: 92
Location: Kyiv, Ukraine
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sorry i had a typo. the equasion was supposed to read 400/(t-2)=10+400/t

average speed of A equals av speed of B + 10.
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