A boy leaves his house at 9.30 am for his school.the school is 2km away and classes start at 10.00am.if he walks at a speed of 3km/h for the first kilometre at what speed should he walkthe second kilometre to reach just in time
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Answer:
6 km/h
Step-by-step explanation:
Leaves house: 9:30 am
Distance to school: 2 km
Start of class: 10:00 am
Speed for 1st kilometer = 3 kph
Time taken for 1st km = Distance / Speed = 1/3 of one hour = 20 minutes
Time at end of 1st km = 9:50 am
Distance left to travel = 1 km
Time left = 10 min = 1/6 of one hour
Speed = Distance / Time = 1 divided by 1/6 = 6 km per hour
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