Q. 904.6( 11 Votes )

Ravi starts for his school at 8:20 a.m. on his bicycle. If he travels at a speed of 10 km/h. then he reaches his school late by 8 minutes but on travelling at 16 km/h he reaches the school 10 minutes early. At what time does the school start?

Answer :

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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