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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.
- How many rounds of the park must Devi Prasad run to complete 2 km?
- 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!
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Solution
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.
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