Question

An express train is running between two station with a uniform speed. if the diameter of each wheel of the train is 42 cm and each wheel make s 1200 revolution per minute. find the speed of the train.​

Answer 1

Step-by-step explanation:

Diameter of the wheel =42cm=42cm

Therefore,

Radius r=21cmr=21cm

It makes 12001200 revolution per minutes.

Distance travelled in 11 revolution =2\pi r=2πr

=\pi d=πd

=\dfrac{22\times 42}{7}=

7

22×42

=132cm=132cm

Distance travelled in 12001200 revolution =132\times 1200cm=132×1200cm

Therefore,

Speed =\dfrac{132\times1200}{1}=

1

132×1200

=\dfrac{132\times1200\times 60km}{1\times 100\times 1000 hour}=

1×100×1000hour

132×1200×60km

=95.04km/h=95.04km/h

Answer 2

Answer:

95.05km/hr Will be the correct answer