Multiple choice general knowledge

The ratio between the speeds of two trains is 7:8 If the second train runs 400 kms in 4 hours, then the speed of the first train is:

  1. 70

  2. 75

  3. 84

  4. 87.5
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The speed ratio is 7:8. Second train's speed = 400 km / 4 hr = 100 km/hr. Using the ratio, first train's speed = (7/8) × 100 = 87.5 km/hr. The key insight is that speeds are directly proportional to the ratio given. Students often mistakenly calculate 7/8 of 400 or subtract incorrectly. Always find one speed first, then apply the ratio.

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