A boy leaves his house at 9.30AM for his school. The school is 2 Km away and classes start at 10.00 Am. If he walks at a speed of 3 Km/hr for the first Km at what speed should he walk the second Km to reach just in time?

Asked by Ayushi Joshi | 31st May, 2013, 06:26: PM

Expert Answer:

distance = 2 km 
total time = 30 min = 0.5 hour
initial speed = 3km/h for first 1 km
Hence time taken = distance/speed = 1/3 h 
time left = 0.5 - 1/3 = 0.5/3 h
distance left = 1 km
 
Hence speed at which he should walk the second km wouldeb 1/(0.5/3) = 6 km/h

Answered by  | 31st May, 2013, 08:06: PM

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