Question

A boy leave his house at 9:30a.m for his school. the school is 2 km away and classes start at 10:00a.m if he walks at a speed of 3km/hr for the first kilometre at what speed should he walk the second kilometre to reach just in time

Answer 1

He has just 30 minutes
So he should walk 6 km /h to reach school in time.

Distance =2km
Total time=30min=0.5hour
Initial speed=3km/h
Time taken first km=1/3h
Time left=
0.5-1/3=0.5/3h
Distance left=1 km
Hence speed at which walk the second km would be 1/[0.5/3]=6km





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Answer 2

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

 

So, the speed at which he should walk the second km wouldeb 1/(0.5/3)
= 6 km/h


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