Question

The ratio between the speeds of two trains is 7 : 8. if the second train runs 400 km in 4 hours, then the speed of the first train is:

a. 70 km/hr
b. 75 km/hr
c. 84 km/hr
d. 87.5 km/hr

Answer 1

The speed of the first train is 87.5 km/hr.

Step-by-step explanation:

To find the speed of the first train, we can use the given ratio of 7:8 and the information about the speed of the second train.

The second train runs 400 km in 4 hours, so its speed is 400 km/4 hours = 100 km/h.

Using the ratio, we can calculate the speed of the first train as: 7/8 * 100 km/h = 87.5 km/h.

Therefore, the speed of the first train is d. 87.5 km/hr.