# Ravi starts for h

Let the total distance = x km

Let the time taken by Ravi to reach the school at sharp time = t min

If the speed of the bicycle is 10km/h, then he reaches his school late by 8 min  (1)

If the speed of the bicycle is 16km/h, then he reaches his school 10min early.  (2)

On subtracting equation (2) from (1)    Now, put x = 8 in Eq. (i),
we get    Hence starting time of school is 8:20 + 40min i.e. 9:00am

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