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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1
Answer:
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Answered by
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Answer:
6 km/hr
Explanation:
v = 3km/hr = 5/6 m/s
s = 1 km =1000 m
s = v*t
t = s/v
=1000/(5/6)
t=1200s =20 min
remaining 1 km he has to walk in 10 min
so new v = s/remaining t
= 1000/ 600
new v = 5/3 m/s = 6 km/hr
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