Question

a rectangular field is 90 metre by 70 metre. a man walks around it the rate of 4 kilometre per hour. what time all he take in making 5 rounds?

Answer 1

firstly found the area of rectangular field
area= l multiply by b
$area = 90 \times 70 = 630m$
then change 4 km into m
1km= 1000m
4km=4000m
the man walk 4000m in 1 hour
then in 1minute= 4000/60=66.6m
3150m= 3150/66.6=.........47minute