A wheel of diameter 70 cm makes 400 revolutions per minute. Find the speed of the vehicle in km/h. MCQ with Answer and Explanation

Question

Share Report Error

A wheel of diameter 70 cm makes 400 revolutions per minute. Find the speed of the vehicle in km/h.

A. 55.4 km/h

B. 48.2 km/h

C. 52.8 km/h

D. 60.0 km/h

Answer: Option C

Solution (By JKExamLibrary)

Radius r = 35 cm = 0.35 meters. Circumference = 2 * (22/7) * 0.35 = 2.2 meters. Distance covered in 1 minute = 400 * 2.2 = 880 meters. Distance covered in 1 hour = 880 * 60 = 52800 meters = 52.8 km. Speed = 52.8 km/h.

This question belongs to: Maths Time Speed and Distance

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Time Speed and Distance Questions

Question #1

Share Report

A motorboat covers 16 km downstream in 1 hour and covers the same distance upstream in 2 hours. Find the speed of the boat in still water.

A. 10 km/h

B. 15 km/h

C. 12 km/h

D. 14 km/h

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
Downstream speed = 16 / 1 = 16 km/h. Upstream speed = 16 / 2 = 8 km/h. Speed in still water = (16 + 8) / 2 = 12 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

Share Report

A luxury car handles a tracking route sector of 180 km. It finishes the first half segment stretch at 45 km/h and the second half sector at 60 km/h. Find the mean average speed recorded across the full route.

A. 48.2 km/h

B. 51.42 km/h

C. 53.50 km/h

D. 55.00 km/h

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Average Speed across sectors = 2xy / (x + y) = (2 * 45 * 60) / (45 + 60) = 5400 / 105 = 51.42 km/h.

This question belongs to: Maths Time Speed and Distance