Question

(b) A train takes 12 hours to reach a destination by travelling at 45 km per hour. How long will it take to travel the same distance at 60 km per hour? Use the method of proportion.​

Answer 1

Answer:

45:12::60:x

45*12/60 - 9hours

Answer 2

Answer:

Firstly,

we have to make a table so

12hr - 45km

xhrs - 60km

therefore, the proportion stands:

12:45::x:60

now, we know that the product of the means is always equal to the products of the extreems

therefore,

=> 45x (product of the means) = 60 x 12 (product of the extreems)

=> 45x = 720

=> x = 720/45 (first cancelling by 5 we get 144/9. then cancelling by 9 we get 16)

therefore, we conclude that:

x = 16

ans: The train will take 16hrs to travel the same distance at 60km per hrs.

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