Multiple choice

A train covers 600 km in a certain time. While coming back, it increases its speed by 20 km and completes the journey in 8 hours less. Find the two speeds.

  1. 20, 50

  2. 30, 50

  3. 30, 45

  4. 35, 40

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let x and y be the two speeds. y = x + 20 Time taken for up trip = 600/x Time taken for return = 600/(x + 20) Difference = 8 hours Or 12000 = 8x(x + 20)x = 30 y = 50

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