Question
A man decided to cover 7.5 km in 72 minutes. He decided
to cover two thirds of the distance at 5 km/h and the remaining at some different speed. Find the speed after two third distance has been covered.Solution
Distance covered at 5 km/h- Distance = 2/3 Ć 7.5 km = 5 km Time taken for 5 km at 5 km/h- Time 5 km /5 km/h = 1 hour = 60 minutes Remaining distance and time- Remaining distance = 7.5 km -5 km = 2.5 km Remaining time = 72 minutes - 60 minutes = 12 minutes Remaining time in hours = 12 minutes /60 = 0.2 hours Required speed- Speed = 2.5 km /0.2 hours =12.5 km/h
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