Question

the ratio of the speed of two trains is 7:8. if the second train covers 400 km in 4 h find out the speed of the first train.

Answer 1

Hii..
Here is your answer..

Solution:-
Let the speed be 7x and 8x km/h

$= > 8x = 4004 \\ = > x = \frac{4004}{8} \\ = > x = 12.5km \: per \: hrs$
So,
Speed of first train =
$= > 7x \\ = > 7 \times 12.5 \\ = > 87.5km \: per \: hrs$
Hope it helps uh...✌️✌️✌️