A car tracks a total segment of 360 km. If the uniform speed is boosted by 15 km/h, it covers the course in 4 hours flat. Find the original speed. MCQ with Answer and Explanation

A car tracks a total segment of 360 km. If the uniform speed is boosted by 15 km/h, it covers the course in 4 hours flat. Find the original speed.
A. 80 km/h
B. 70 km/h
C. 75 km/h
D. 85 km/h
Answer: Option C
Solution (By JKSSB Mock Tests)
New speed = 360 / 4 = 90 km/h. Since the new speed is 15 km/h faster than original speed, original speed = 90 - 15 = 75 km/h.

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Practice More Time Speed and Distance Questions

Question #1
A train 100 meters long running at 90 km/h crosses another train 150 meters long running at 54 km/h in the same direction. How much time do they take to cross each other?
A. 30 seconds
B. 25 seconds
C. 35 seconds
D. 20 seconds

Correct Answer: Option B


Explanation:
Total distance = 100 + 150 = 250 meters. Relative speed in same direction = 90 - 54 = 36 km/h = 36 * (5/18) = 10 m/s. Time taken = 250 / 10 = 25 seconds.

This question belongs to: Maths Time Speed and Distance
Question #2
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. 53.50 km/h
B. 55.00 km/h
C. 51.42 km/h
D. 48.2 km/h

Correct Answer: Option C


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
Question #3
In a 500-meter dash trial heat, runner A clocks across the tape in 50 seconds, while runner B marks a finish layout in 55 seconds. By what distance does runner A beat runner B?
A. 50.00 meters
B. 48.25 meters
C. 42.34 meters
D. 45.45 meters

Correct Answer: Option D


Explanation:
Speed of runner B = 500 / 55 = 100 / 11 m/s. Distance covered by runner B when runner A finishes at 50 seconds = (100 / 11) * 50 = 5000 / 11 = 454.54 meters. Margin distance = 500 - 454.54 = 45.45 meters.

This question belongs to: Maths Time Speed and Distance