Question

Anand leaves his house at 8:30 am for his school. the school is 2 km away and classes start at 9:00am .if he walks at a speed of 3 km/h for the first kilometre, at what speed should go walk the second kilometer to reach just in time?

Answer 1

distance = 2 km total time = 30 min = 0.5 hourinitial speed = 3km/h for first 1 kmHence time taken = distance/speed = 1/3 h time left = 0.5 - 1/3 = 0.5/3 hdistance left = 1 km Hence speed at which he should walk the second km would be 1/(0.5/3) = 6 km/h

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