Question

one day a boy walked from his house to his school, at the speed of 4 km/h. And he reached the school ten minutes late. Next day he ran at a speed of 8 km/h and was 5 minutes early to the school. Find the distance between his school and and the house.

Answer 1

Answer:

speed1=4km/h=1 m/s

speed2=8km/h=2m/s

time1=10min=600sec

time2=5min=300sec

let distance be x

difference if timing= 15min=15/60=1/4

x/4-x/8=1/4

4x-8x/32=1/4

4x/32=1/4

4x=1/4×32

4x=8

x=8/4

x=2 meter

distance between school and house is 2m