Question

car at the speed of 12 km per hour and returns at the speed of 9 km per hour if he covers the distance in 2 hour and 20 minutes how what is the distance​

Answer 1

Answer:

The distance is = [(9 × 12)/(12 + 9)] × 7/3 = 12 km

Detailed Method:

2 hr 20 min = 2 + 1/3 = 7/3

Let the total distance be x km.

According to the question

x/12 + x/9 = 7/3

⇒ (4x + 3x)36 = 7/3

⇒ 7x/36 = 7/3

⇒ x = 7/3 × (36/7)

∴ x = 12