The ratio of the speeds of two trains is 2 : 7. If the first train runs 250 km in 5 hours, then the sum of the speeds (in km/h) of both the trains is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 225
Given:
Ratio of speed = 2 : 7
First train covers 250 km in 5 hours
Concept Used:
Speed Distance/Time
Explanation:
Let, the speed of the first train = 2x
The speed of the second train = 7x
So, 2x = 250/5 = 50
⇒ x = 50/2 = 25
Therefore, The speed of the first train = 2 × 25 = 50 km/h
Also, the speed of the second train 7 x 25 = 175 km/h
The sum of both speed 50 + 175 = 225 km/h
Hence the sum of the speeds (in km/h) of both trains is 225 km/h