Question

Each wheel of a bicycle has a radius of 70 cm. How many complete revolutions does each

wheel make to cover a distance of 2km 640m?

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Answer 1

Answer:

the radius of a circle is 70 cm

so to convert cm to km we have to divide 100000 to 70

it must be 0.0007 km

then to find circumference of the circle

2πr= 2 ×22/7× 7/10000= .0044 km

the circle revolve .0044 km when u move the wheel once

then to find how many times the wheel revolve to cover 2 km 640 m

we have to convert the distance into km so the distance is 2.64 km

then to find the number of revolution,the formula is

= total distance/ the distance when the wheel move once

= 2.64/.0044 = 600

each wheel revolve 600 times

Answer 2

Answer:

Radius =70cm

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

=2× 22/7×70

=440cm

Distance covered in 300 rotation =300×440

=132000= 132000/100000

=1.32km

Given that distance of covered in 5 minutes or 5/60 hour.

Therefore,

Speed of cycle = distance/time

= 1.32/5/60. =1.32×60/5. =15.84km/hr