Question

a boy walks from his home to school the distance of 0.5km in 20min he returned to his home in time 1500sec .Find the avrage speed if the boy(in meater per second)

Answer 1

First we have to change 20 min into seconds,i.e.

$20 \times 60$

1200 seconds

Now we have to change 0.5km in metres,i.e.

$0.5 \times 1000$

500m

now, Average speed is

Total distance travelled/total time taken

so,

$500 + 500 \div 1500 + 1200$

0.3m/s