SOLUTION: Car A and car B leave Halifax on the same road 1 hr apart. Car A leaves first and travels at a steady 80 km/h. How fast must car B travel to overtake car A in 4 hours?

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Question 466938: Car A and car B leave Halifax on the same road 1 hr apart. Car A leaves first and travels at a steady 80 km/h. How fast must car B travel to overtake car A in 4 hours?
Found 2 solutions by Big Poop, robertb:
Answer by Big Poop(157) About Me  (Show Source):
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = speed of car B. If car B is to overtake car A in 4 hours, then car A must have been on the road for 4 + 1 = 5 hours. Hence the distance traveled by car A should have been (5 hr)*(80 km/hr) = 400 km.
==> 4x = 400 ==> x = 100 km/hr, the speed of car B.