The radius of the wheel of a vehicle is 70 cm. The wheel makes 10 revolutions in 5 seconds. The speed of the vehicle is-

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RRB ASSISTANT LOCO PILOT (Patna) 2013 click here to view all questions

The radius of the wheel of a vehicle is 70 cm. The wheel makes 10 revolutions in 5 seconds. The speed of the vehicle is-

A29.46 km/ hr

B31.68 km/ hr

C36.25 km/ hr

D32.72 km/ hr

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Correct answer is : 31.68 km/hr Explanation: Circumference = 2πr $= 2 \times \frac{22}{7} \times \text{70 cm}$ = 440 cm Distance travelled in 10 revolutions = 440 x 10 cm = 4400 cm = 44 m $\therefore Speed = \frac{distance}{time}$ $= \frac{44}{5} \text{ m/sec}$ $= \frac{44}{5} \times \frac{18}{5} \text{ km/hr}$ $= 31.68 \text{ km/hr}$ raju ? answered Jan 8 '2020 at 10:50 All Comments

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