Multiple choice

A car is running at the speed of 60 km/hr. It covers a certain distance in 20 minutes. Find the required speed of a bus which covers the distance 20 km more than the distance covered by the car in the same time.

  1. $80 km/hr$
  2. $100 km/hr$
  3. $120 km/hr$
  4. $140 km/hr$
  5. $150 km/hr$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Car's speed is 60 km/hr for 20 minutes (1/3 hour), so distance = 60 × 1/3 = 20 km. Bus must cover 20 + 20 = 40 km in the same 1/3 hour. Required speed = 40 ÷ 1/3 = 120 km/hr. Option B (100) would be too slow for 40 km in 20 min.

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