Question
Download Solution PDFThe 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:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
Ratio of speeds of two trains = 7:8
Speed of the second train = 400 km in 4 hours
Formula Used:
Speed = Distance / Time
Calculation:
Speed of the second train = 400 km / 4 hours
Speed of the second train = 100 km/hr
Ratio of speeds of the two trains = 7:8
Let the speed of the first train be 7x and the speed of the second train be 8x.
We know 8x = 100 km/hr
⇒ x = 100 / 8
⇒ x = 12.5
Speed of the first train = 7x
⇒ Speed of the first train = 7 × 12.5
⇒ Speed of the first train = 87.5 km/hr
The speed of the first train is 87.5 km/hr.
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