Question

8. A boy leaves his house at 9.30 a.m. for his
school. The school is 2 km away and classes start at
10.00 a.m. If he walks at a speed of 3 km/h for the
first kilometre, at what speed should he walk the
second kilometre to reach just in time?
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Answer 1

Hey Frnd Here Is Your Answer-------

Explanation:

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

Answer 2

Answer:

Step by step explanation:

Distance= 2km

Total time =30min=0.5hour

Initial speed=3km/h for first 1km

Hence time taken= distance/speed=1/3h

Time left =0.5-1/3=0.5/3H

Distance left= 1km

Hence speed at which he should walk the second km Would be 1/(0.5/3)=6km/h.