The ratio of the speed of two trains is 7:8. If the second train covers 400 km…
2023
The ratio of the speed of two trains is 7:8. If the second train covers 400 km in 4 h, find out the speed of the first train.
- A.
69.4 km/h
- B.
78.6 km/h
- C.
87.5 km/h
- D.
40.5 km/h
Attempted by 27 students.
Show answer & explanation
Correct answer: C
Answer:
87.5 km/h
Explanation:
Let the speed of the two trains be 7x and 8x.
Then, 8x = 400 / 4
=> 8x = 100 => x = 12.5 km/h.
Hence, speed of the first train = 7x = 7 × 12.5 = 87.5 km/h.