Question

The ratio of the speeds of two trains is 3 : 4. If the second train covers a distance of 900 km in 5 hrs, then what is the speed of the first train?  
1. 130 km/h
2. 132 km/h
3. 135 km/h
4. 138 km/h

Answer 1

Correct Answer - Option 3 : 135 km/h

Given:

Speed ratio = 3 : 4

Distance = 900 km

Time = 5 hrs

Formula used:

Speed = Distance/time

Calculation:

Let the speeds be 3x and 4x

A.T.Q

4x = 900/5

⇒ x = 900/20 = 45 

⇒ 3x = 3 × 45 = 135 km/h

∴ The speed is 135 km/h