WBCS.LIVE practice question

Two cars start from a house at an interval of 10 minutes and travel at a speed of 20 km/hr. With how much speed (km/hr) should a woman coming from the opposite direction towards the house travel, to meet the cars at an interval of 8 minutes?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 4
  2. 7
  3. 6
  4. 5

Correct answer and explanation

Correct answer: 5

Explanation: āœ… Correct Answer: D. 5 šŸ“š Explanation: Using the relative speed concept for objects moving in opposite directions: (20 + x) x 8 = 20 x 10. (20 + x) x 8 = 200. Solving for x: 20 + x = 25, which means x = 5 km/hr. The woman should travel at 5 km/hr to meet the cars at the desired interval.