Question

Running Exercise

The doctor has told Devi Prasad to run 2 km every day to stay fit. He took one round of this field. How far did he run?

The field was very far from his home. So he chose a park nearby. The boundary of the park was about 400 metres long.

1. How many rounds of the park must Devi Prasad run to complete 2 km?
2. One day the weather was very good and a cool breeze was blowing. He felt so good that he kept jogging till he got tired after 8 rounds. That day he ran ____ km and ____ metres!

Answer 1

Devi Prasad ran one round the field

= 500 m + 500 m + 500 m + 500 m

= 2000 m

= 2000 ÷ 1000 km

= 2 km

(1) 2 km = 2 × 1000 m
= 2000 m
So to complete 2000 m, Devi Prasad must complete
= 2000 m ÷ 400 m
= 5 rounds
Devi Prasad has to run 5 rounds of the park.

(b) Devi Prasad covers a distance in 8 rounds = 400 m × 8

= 3200 m

= 3000 m + 200 m       ...(3000 m = 3000 ÷ 1000 = 3 km)

= 3 km 200 m

That every day he ran 3 km and 200 m.