Question

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
​

Answer 1

Answer:

Step-by-step explanation:Speed of second train = Distance travelled / time = 400 /5 = 80 km/hr

Ratio of speeds = 7 :8 = (7/8) :1

If speed of second train is x, then the speed of first train is 7x/8

7x/8 = 7 x 80/8 = 70

So, speed of first train is 70 km/hr

Answer 2

Answer:

70 Km/h

Step-by-step explanation:

Let us take the speeds as 7x and 8x of first and second train respectively

If second train runs 400 Km's in 5 hours then it will run 80 Km's in 1 hour

8x = 80

Then x = 10

7x = 7 * 10 = 70

The speed of the first train will be 70 Km/h