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You are to drive for an exam in another town, at a distance of 300 km on an expressway. The exam begins at 11:15 am. You plan to drive at 100 km/h, so you leave at 8:00 am to allow for first 100 km but due to some construction work you have to move with 40km/h for 40 km. what is the least speed needed for the rest of the trip to arrive in time for the exam?

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128km/h

100km/h

90km/h

140km/h

answer is C.

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Detailed Solution

Remaining distance = 300-(100+40)
= 160 km
Time remaining = 3.25-(1+1) =1.25 h
Least speed = $\frac{160}{1.25} = 128 \frac{k m}{h r}$

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