Question

a cyclist is moving at a speed 20km/h for 20 minutes . by how much should he increase his speed if he needs to cover the distance in 15 minutes​

Answer 1

Answer:

Needs to increase his speed by 6.67 km/hr

so that his new speed is 26.67 km/hr

Step-by-step explanation:

20 minutes = 20/60 hr = 1/3 hr

distance = speed × time = 20 km / hr  ×  1/3 hr  =  20/3 km

15 minutes = 15/60 hr = 1/4 hr

To do same distance in 15 minutes, needs...

speed = distance / time = ( 20/3 km ) / (1/4 hr )

         = 80/3 km/hr

         ≈ 26.67 km/hr

That an increase of 26.67 - 20 = 6.67 km/hr