Question
A person travels from the hostel to the college with a
speed of 15 kmph from the bicycle and reaches a 4.5 minute delay. If he runs a bike with a speed of 20 kmph, then it reaches 4.5 minutes. Describe the distance between hostel and college. (In km)Solution
Let us consider the time of journey be t hrs, As we know, the distance is same According to the question 15 (t + 4.5/60) = 20 (t-4.5/60) 3 (t + 3/40) = 4 (t-3/40) 3t+ 9/40 = 4t-12/40 4t-3t = 9/40 + 12/40 t = 21/40 Distance = speed × time Distance = 15 (21/40 + 3/40) = 9 km
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