Multiple choice

Raj and Vishal are two friends who complete their travel journey from point A to B by using four different modes of transport: bicycle, bus, scooter, and car, which move at the speeds of 10, 20, 30, and 40 kmph, respectively. To travel from point A to B, Raj uses each mode of transport for 1 4 t h of his total journey time, while Vishal takes each mode of transport for 1 4 t h of the total distance. The approximate percentage by which Vishal's travel time exceeds Raj's travel time is:

  1. 15

  2. 30

  3. 45

  4. 60

  5. a
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Raj's average speed is the arithmetic mean because he spends equal time at each speed, giving 25 km/h. Vishal's average speed is the harmonic mean because he covers equal distances, giving about 19.2 km/h, so his travel time is about 30% greater.

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