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Question

Q. The wheel of an engine having a circumference of 30 decimeter, makes 10 revolutions in 5 seconds. What is speed of the wheel (in km/hr)?

Q. 30 डेसीमीटर की परिधि वाले एक इंज़न का पहिया, 5 सेकंड में 10 चक्कर लगाता है। पहिए की गति (किमी/घं में) क्या है?

A
16
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B
24.5
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C
21.6
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D
36
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Solution

The correct option is C 21.6

Number of revolutions in 1 hour = (10 × 60 × 60)/5 = 7200
Distance moved in 1 revolution = Circumference of the wheel = 30 dm = 3m (as 10 decimeter = 1m.)
Hence, the distance moved in one hour = (3 × 7200)/1000 km = 21.6 km
Therefore, the speed of the wheel = 21.6 km/hr.

1 घंटे में चक्करों की संख्या = 10×60×605=7200
1 चक्कर में तय की गयी दूरी = पहिए की परिधि = 30 डे.मी. = 3 मी.
इस प्रकार, एक घंटे में चली गयी दूरी = 3×72001000 21.6 किमी.
इसलिए, पहिए की गति = 21.6 किमी/घं.


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