A boy is cycling such that the wheels of the cycle are making 140 revolutions per minute. If

the diameter of the wheel is 60 cm, calculate the speed per hour which the boy is cycling.

It is right sreenidhi ...!!! 😄😄😄😄

its ryt

15.84km/hr

wrong
 

15.6
 

Hope this helps you 😃😃 And yes thumbs up

See ans

15.84 is right answer

15.84 km per hr

??Radius of the wheel = r = 60 / 2 = 30 cm

Circumference of the wheel = 2 ? r = (2 x 22 / 7 x 30) cm = 1320 / 7 cm

=> Distance covered by the wheel in 1 revolution = 1320 / 7 cm

=> Distance covered by the wheel in 140 revolutions = 1320 / 7 x 140 cm

= (1320 / 7 x 140 x 1 / 100000) km = 264 / 1000 km

This means that distance covered by the wheel in 1 minute = Distance covered in 140 revolutions

= 264 / 1000 km

Therefore, Distance covered in 1 hour = 264 / 1000 x 60 km = 15.84 km

Hence, the speed with which the boy is cycling is 15.84 km / hr

Ana is 15.84

🐅

I think it is correct