Question

The speeds of two trains are in the ratio of
3:5. If the speed of the 1st train is 15 km/hr,
then what is the speed of the second train?​

Answer 1

Answer:

25km/hr

Step-by-step explanation:

By sum,

3:5::15:x

3/5=15/x

3x=15*5

x=75/3

 =25

Ans) The speed of the second train is 25km/hr

Hope this helps.

Answer 2

Answer:

25 km/hr

Step-by-step explanation:

3:5 = 15:x

3/5 = 15/x

5/3 = x/15

x = 15*5/3

x = 5*5

x = 25km/hr

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Edited

let the speeds be 3x and 5x

the first train is 3x

the second train is 5x

We know the speed of first train that is 15

3x = 15

x = 15/3

x = 5

the speed of second train is 5x

5x= 5*5         *because x=5

5x = 25 which is the speed of the second train