Question

You are to drive to an interview in another town, at a distance of 300 km on an expressway.The interview is at 11!15 A.M. You plan to drive at 100 km/h, so you leave at 8!00 A.M. to allow some extra time.You drive at that speed for the first 100 km, but then construction work forces you to slow to 40 km/h for 40 km. What would be the least speedneeded for the rest of the trip to arrive in time for the interview?

Answer 1

Answer:

139.130km/hr

Explanation:

If he leave home atn8:00AM so he has to cover 300km in only 3.15hr

$for \: first \: 100km \: his \: speed \: was \: 100km {hr}^{ - 1} \\ time = \frac{100}{100} = 1hr \\ \\ for \: next \: 40km \: his \: speed \: was\: 40km {hr}^{ - 1} \\ \\ time = \frac{40}{40} = 1hr \\ \\ to \: reach \: destination \: he \: has \: to \:cover \\ 160km \: distance \: in \: 1.15hr \\ \\ so \\ speed = \frac{distance}{time} = \frac{160}{1.15} = 139.130kmhr {}^{ - 1}$

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