Question

The distance from a boy's house to his school is 10 km he left home at 6:30 a.m. cycling at the rate of 4 km/h if he spent 15 minutes on the way waiting for a friend,when did he get to school.

Answer 1

4*2=8

4*1/2=2

8+2=10

30-15=15

so 2 hours and 15 minutes.