Question

a boy can run 7 metre in 9 seconds how much time does we need for 350 metre at same speed​

Answer 1

Answer:

7m=9s

350m=x

x=(350)(9)/7

x=450

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Answer 2

Answer: 7 minutes and 30 seconds

Step-by-step explanation:

The boy runs at the rate of 7m in 9 sec

=> He runs 1m in (9/7) sec

Hence, for 350m, he will need:

350 * (9/7) sec

= 50 * 9 sec

= 450 sec

= 7 min and 30 sec

Alternate method:

As the boy runs at the same speed, the ratio of distance to time will remain the same. This therefore becomes a problem of ratio and proportion.

We know that If a:b :: c:d, then (a/b) = (c/d)

Using the above we get:

7:9 :: 350:x

7/9 = 350/x

x = (350 * 9) / 7

  = 50 * 9

  = 450 sec

   = 7 min 30 sec