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The ratio between the speeds of two trains is 7:8 .if the second train runs 400 kms .in 5 hours, the speed of the first train is?
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The ratio between the speeds of two trains is 7:8 .if the second train...
Given:
- The ratio between the speeds of two trains is 7:8
- The second train runs 400 kms in 5 hours

To find:
- The speed of the first train

Solution:
Let the speeds of the two trains be 7x and 8x.

We know that distance = speed x time.

For the second train, distance = 400 kms and time = 5 hours.
Therefore, speed of second train = distance/time = 400/5 = 80 km/hr

We can now use the ratio of speeds to find the speed of the first train.
7x/8x = speed of first train/speed of second train
Simplifying, we get:
7x/8x = speed of first train/80
Cross multiplying, we get:
Speed of first train = (7x/8x) x 80 = 70 km/hr

Therefore, the speed of the first train is 70 km/hr.

Answer:
- The speed of the first train is 70 km/hr.
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The ratio between the speeds of two trains is 7:8 .if the second train runs 400 kms .in 5 hours, the speed of the first train is?
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