Question

a boy is cycling such that The Wheels of the cycle are making 140 revolutions per hour if the diameter of the wheel is 60 CM then calculate the speed in kilometre per hour with which the boy is cycling

Answer 1

$\mathbb{ SOLUTION }$ :

The cycle makes 140 revolutions per hour.
Diameter of the wheel = 60 cm
Radius of the wheel = 30 cm

Circumference of circle = 2πr

= 2×22/7×30

= 188.57 cm

Distance covered in 140 revolutions
= 140 × 188.57
= 26400 cm

Speed = $\frac{26400}{100000}$ km/h

= 0.264 km/h

Answer 2

Given : a boy is cycling such that The Wheels of the cycle are making 140 revolutions per hour if the diameter of the wheel is 60 CM.

To Find : the speed in kilometre per hour with which the boy is cycling.

Solution :

The cycle makes revolutions = 140/h
Diameter of the wheel = 60 cm
Radius of the wheel =Diameter/2 = 60/2= 30 cm

Circumference of circle = 2πr

= 2×22/7×30

= 188.57 cm
Distance covered in 1 Revolution = 188.57 cm

Distance covered in 140 revolutions

= 140 × 188.57

= 26400 cm

Speed = Distance/Time = 26400/100000

= 0.264 km/h

#Be Brainly !!