Question

a train wheel of diameter 49cm travels a distance of 154 m . how many number of revolution does the wheel make

Answer 1

let the no. of revolution be x
acc. to the question
2π(49/2)x=15400
49πx=15400
(49*22/7)x=15400
7*22x=15400
154x=15400
x=100
therefore wheel makes 100 revolutions..

hope this helps:p

Answer 2

Diameter of the wheel=49cm
Radius of the wheel=49/2cm
Circumference of the wheel=2πr
=2×22/7×49/2
=154cm
=154/100m
=1.54m
Therefore,distance covered by wheel in one revolution is equals to 1.54m.
Distance travelled by Train =154m
Hence,
total no.of revolutions=(total distance covered by wheel)/(distance covered by wheel in one revolution)
=154/1.54=100
Hence the wheel make 100 revolutions to cover 154m.