Tim and Rick both can run at speed V1 and walk at speed V2, where V1 > V2. They set off together on a journey of distance D. Rick walks half of the distance and runs the other half. Tim walks half of the time and runs the other half.
How long does it take Rick to cover the distance D, in terms of V2, V1, and D?
I don't want just an answer. I want someone to explain it. I have no clue where to start.
How long does it take Rick to cover the distance D, in terms of V2, V1, and D?
I don't want just an answer. I want someone to explain it. I have no clue where to start.
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Remember distance = rate * time
Rick walks half the distance, so time (first half for Rick) = (D/2)/V2 + (D/2)/V1
So, really you have time-first-half-Rick = distance-first-half-Rick divided by speed-first-half-Rick
same for second except the speed is different of course
Something in addition to the answer: the problem states that Rick CAN move at those speeds. That doesn't mean that he moves at those speeds in the problem. Poorly worded
Rick walks half the distance, so time (first half for Rick) = (D/2)/V2 + (D/2)/V1
So, really you have time-first-half-Rick = distance-first-half-Rick divided by speed-first-half-Rick
same for second except the speed is different of course
Something in addition to the answer: the problem states that Rick CAN move at those speeds. That doesn't mean that he moves at those speeds in the problem. Poorly worded