Question: 21
* How many rounds of the park must Devi Prasad run to complete 2 km?
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Answer: We know that,
1 km = 1000 m
So,
2 km = 2000 m
Hence, to complete 2000 m, Devi Prasad must complete
= 2000 m ÷ 400 m
= 5 rounds
Therefore, Devi Prasad has to complete 5 rounds of the park
* 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: Distance covered to complete one round of the park = 400 m
So, distance covered by Devi Prasad to complete 8 rounds of the park = 400 m × 8
= 3200 m
We know,
1000 m = 1 km
Therefore, 3200 m = 3000 m + 200 m
3000 m = 3000 ÷ 1000
= 3 km 200 m
Hence, Devi Prasad ran 3 km 200 m to complete 8 rounds of the park