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.
Answers
Step-by-step explanation:
Revolution Per Minute = 140
Diameter = 60cm
Speed = ?
Circumference = 2(pi)r
=2*22/7*30
=188.57cm
Distance travelled in an hour = 60*140 per min*Circumference
=8400*188.57cm
=1583988cm
=15.83988km
Therefore, speed = 15.8 km per hour.
Answer:
diameter of the wheel is 60cm, calculate the speed per hour with which the boy is cycling.
December 20, 2019avatar
Prashant Vaibhav
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ANSWER
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.