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PS : I referred GMATPill SC Guide this morning and got some wrong OA and some debatable OA. I think this probability extends even to the Quant section of the guide where some OA may be wrong. I will advise you to contact the author and inform the discrepancy.
Yes it's 48. The link to the original question is here:
A taxi leaves Point A 5 hours after a bus left the same spot. The bus is traveling 30 mph slower than the taxi. Find the speed of the taxi, if it overtakes the bus in three hours.
The idea in this question is to set the distance for each of them to be equivalent. Each of them has a distinct "r*t". Set these equal to each other because the distance covered for each will be the same at the moment that the taxi overcomes the bus.
Re: A taxi leaves Point A 5 hours after a bus left the same spot [#permalink]
30 Sep 2015, 01:04
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Why is the bus only doing 18 mph? Is it some kind of special GMAT bus?
That is an interesting question. May be it is a sign that you should not board this bus
As for solving the question.
Let us assume that the speed of the Taxi = x Hence the speed of the bus = x - 30
At the point of overtaking, both the bus and the taxi would have covered equal distance, so we can safely equate them Also, note that the Taxi has been running for 3 hours, whereas the bus has been running for 8 hours.
\(x*3 = (x-30)*8\) \(3x = 8x - 240\) \(5x = 240\) Or \(x = 48\). Option C