The ratio of the speeds of two trains is 5:7. If the faster train travels 210 km in 3 hours, find the time taken by the slower train to cover 150 km.
Show answer & explanation
Correct answer: C
Explanation
Given:
Speed Ratio = 5 : 7
Faster Train (7 parts) ⇒ 210 km, Time = 3 hours
According to the formula:
Speed = Distance / Time
Speed of the faster train = 210 / 3 = 70 km/h
1 part = 70 / 7 = 10 km/h
Speed of the slower train = 5 × 10 = 50 km/h
Time = Distance / Speed = 150 / 50 = 3 hours