Question

The radius of a wheel of a cycle is 70cm and it takes 5 minutes to make 300 rotations . Find the speed of the cycle in km per hour.
$take \: \pi= \frac{22}{7}$
​

Answer 1

Answer:

Radius =70cm

Distance covered in one rotation = circumference of wheel =2πr

=2×

7

22

×70

=440cm

Distance covered in 300 rotation =300×440

=132000=

100000

132000

=1.32km

Given that distance of 1.32km is covered in 5 minutes or

60

5

hour.

Therefore,

Speed of cycle =

time

distance

=

(

60

5

)

1.32

=

5

1.32×60

=15.84km/hr