A boy leaves his house at 9:30am for his school.The school is 2km away and class start 10:00 am.If he walk at speed 3km/hr for first kilometre at what speed should he walk for the second kilometre to reach just in time
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Explanation:
D = 2 km
T = 30 min = 1/2 hr
U = 3km/hr for 1 km
T = 1/3 hr
Time Left = 1/2 - 1/3 = 1/6 hr
Distance Left = 1 km
So, Speed = 1/ 1/6
=6km/hr
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