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his bike trip

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his bike trip

by sanju09 » Sat Apr 04, 2009 3:29 am
For the first part of his bike trip, Dag rode down a hill at x miles per hour for t hours. For the rest of his trip, Dag rode up a hill at half that speed for twice as long. What was Dag's average speed, in miles per hour, for his entire trip?
A. ½ x
B. (2/3) x
C. ¾ x
D. (5/6) x
E. x
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by moutar » Sun Apr 05, 2009 3:43 am
distance = speed*time

d1 = x*t
d2 = (x/2)*2t = xt

Average speed = total distance/total time
= 2xt / (t + 2t)
= 2xt / 3t
= 2x/3

Answer B
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