Question
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:Solution
Let, the speed of the first train = 2x The speed of the second train = 7x So, 2x = 250/5 = 50 ⇒ x = 50/2 = 25 ∴ The speed of the first train = 2 × 25 = 50 km/h Also, the speed of the second train = 7 × 25 = 175 km/h The sum of both speed = 50 + 175 = 225 km/h ∴ The sum of the speeds (in km/h) of both the trains is 225 km/h
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