Question

-) 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 with which the boy is cycling

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Answer 1

Answer:

15.8km/hr

Step-by-step explanation:

Radius of the wheel =r=

2

60

=30 cm

Circumference of the wheel =2πr=2×

7

22

×30=

7

1320

cm

Distance covered in 1 revolution =

7

1320

cm

Distance covered in 140 revolutions =

7

1320

×140=26400 cm=264 m=

1000

264

km

Distance covered in one minute = Distance covered in 140 revolutions =

1000

264

km

Distance covered in 1 hour =

1000

264

×60=15.84 km

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