Anand leaves his house at 8.30 a.m. for his school. The school is 2 km away and classes start at 9.00 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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6
Answer: 6km/h
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Answer:
Time(t)=30 min=1/2 hr
Total Distance(D)=2km
Speed for 1st km=3km/hr
Since, D=S*t
1 km=3*t
Therefore, t=1/3 hr
So, remaining time=1/2 hr - 1/3 hr
=1/6 hr
Remaining distance=1 km
Therefore, Speed required=D/t
=1*6/1
=6 km/hr
Explanation:
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