a boy leaves his house?at 9;30 a.m for his school the school is 2km away classes start at 10;00 a.m if he walk at speed 3km/h for his first kilometer at what speed should he walks the second kilometer to reach school at time
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Answer:
6 km/hr
Explanation:
Starting time : 9:30 am
End time: 10:00 am
Total time taken during journey = 30 mins
Speed while covering first km = 3 km/hr
Time = Dist/speed
Therefore time taken while covering first km = 1/3 hr = 20 mins
Time left = 30-20 = 10 mins = 1/6 hr
Speed while covering second km = dist remaining/time remaining = 1/(1/6) = 6 km/hr
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