Question

a boy runs 1 kilometre in seven minutes how long will he take to run 400 metre​

Answer 1

Answer:

you can use the proportion to find this direct

Step-by-step explanation:

1 km =1000m, minutes=7

distance=400m , time?? I think

400*7/1000= 2.8minutes

Answer 2

Total Distance the boy ran = 1km = 1000m

Total time taken = 7 minutes = 420 seconds

$speed = \frac{Distance}{Time}$

speed = 1000/420 m per second

Time taken to cover 400m = distance/speed

= 400/(1000/420)

= 400 * 420 /1000

= 4 * 42

= 168 seconds

= 2 minutes 48 seconds

Hope this helps

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