Question

9) A boy can run 64 metres in 7.2 seconds. In how much time can he run 88 metres?

(a) 8.9 seconds (b) 9.9 seconds

(c) 10.2 seconds (d) 0.99 seconds​

Answer 1

Answer:

The answer is option (b) 9.9 seconds  

Step-by-step explanation:

Use ratio and proportion to find the answer .

that is :     64:7.2::88:x        (let the unknown time be X)

    Then :  (7.2*88)/64 will be the answer

which is equal to 9.9 seconds

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Answer 2

Answer:

(b) 9.9seconds

Step-by-step explanation:

time taken for 64 metres = 7.2 sec

time taken for 1 metre = 7.2/64 = 9/80

therefore, time taken for 88 metres = 9/80 × 88 =99/10 =9.9 seconds