Multiple choice

A parachute passes over the head of a man who was walking at the speed of 1.5 km/hr in the same direction. The man could see the parachute for 8 minutes and it was visible to him up to a distance of 1.6 km. What is the speed of the parachute?

  1. 12 km/hr

  2. 12.5 km/hr

  3. 13 km/hr

  4. 13.5 km/hr

  5. 14 km/hr
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Relative speed = distance / time = 1.6 km / (8/60) hr = 1.6 * 7.5 = 12 km/hr. Since they are in the same direction, Parachute speed - Man speed = 12. Parachute speed = 12 + 1.5 = 13.5 km/hr.

AI explanation

Since the parachute and the man travel in the same direction, the relative distance covered is the length of the visible range, which is 1.6 km. The man's speed is 1.5 km/hr, and the relative speed is calculated as distance divided by time, giving 1.6 divided by 8/60 hours, which equals 12 km/hr. Using the relative speed formula for the same direction, the speed of the parachute is the relative speed plus the man's speed, giving 12 + 1.5 = 13.5 km/hr.

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