Question

Hanuman ji was flying at an average speed of 700 km/hr, and lifting Drona Giri mountain. But due to heavy weight of the mountain his speed decreased to 300 km/hr. What was the average speed of Hanuman ji during the journey?
1. 420 km/hr
2. 430 km/hr
3. 240 km/hr
4. 340 km/hr

Answer 1

Correct Answer - Option 1 : 420 km/hr

Given ∶

Speed of Hanuman ji = 700 km/hr

His decreased speed = 300 km/hr

Formula Used ∶

Average  speed = 2ab/(a + b)

Calculation ∶

During the journey,

Average speed = 2 × 700 × 300 /(700 + 300) = 4,20,000/1000 = 420 km/hr

∴ The average speed of Hanuman ji was 420 km/hr.