Book Online Demo

Check Your IQ

Try Test

Courses

Dropper NEET Course Dropper JEE Course Class - 12 NEET Course Class - 12 JEE Course Class - 11 NEET Course Class - 11 JEE Course Class - 10 Foundation NEET Course Class - 10 Foundation JEE Course Class - 10 CBSE Course Class - 9 Foundation NEET Course Class - 9 Foundation JEE Course Class -9 CBSE Course Class - 8 CBSE Course Class - 7 CBSE Course Class - 6 CBSE Course

Offline Centres

A boy is cycling such that the wheels of the cycle are making 140 revolutions per minute. If the diameter of the wheel is $60 cm,$ then find the speed per hour which the boy is cycling.

see full answer

High-Paying Jobs That Even AI Can’t Replace — Through JEE/NEET

🎯 Hear from the experts why preparing for JEE/NEET today sets you up for future-proof, high-income careers tomorrow.

An Intiative by Sri Chaitanya

None of these

15.84

km/hr

16.25

Km/hr

17.55

km/hr

answer is A.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

Given that, a boy is cycling such that the wheels of the cycle are making 140 revolutions per minute and the diameter of the wheel is 60 cm.
We know that, the circumference of circle is

2 π r

.
Calculating the radius of the wheel.

602 = 30 cm

Calculating the circumference of the wheel,

2 π r = 2 × 227 × 30

⇒ 227 × 60

⇒ 13207 cm

Distance covered in 1 revolution is

13207 cm

.
Calculating the distance covered in 140 revolutions.

13207 × 140 = 26400 cm

⇒

264 m

⇒ 2641000 km

We know that, 1 hour equals to 60 minutes.
Calculating the distance covered in 1 hour by computing the product of distance and time.

2641000 × 60 = 15.84 km/ h r

Therefore, the speed per hour which boy is cycling is 15.84 km/hr .
Hence the correct option is 1.

Watch 3-min video & get full concept clarity

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Online Course for IIT JEE

Best Online Course for NEET

Best Online Course for CBSE

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Get Expert Academic Guidance – Connect with a Counselor Today!