A car covers a total loop distance of 300 km. If the baseline speed is raised by 10 km/h, the trip takes 1 hour less. Find the original speed. MCQ with Answer and Explanation

A car covers a total loop distance of 300 km. If the baseline speed is raised by 10 km/h, the trip takes 1 hour less. Find the original speed.
A. 60 km/h
B. 45 km/h
C. 55 km/h
D. 50 km/h
Answer: Option D
Solution (By JKSSB Mock Tests)
Let original speed be s. 300/s - 300/(s+10) = 1 => 3000 = s(s+10). Solving s^2 + 10s - 3000 = 0 yields (s-50)(s+60) = 0. Speed = 50 km/h.

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Practice More Time Speed and Distance Questions

Question #1
A cargo container vehicle spans 450 meters in exactly 30 seconds. Find its baseline speed index in km/h.
A. 54 km/h
B. 66 km/h
C. 60 km/h
D. 48 km/h

Correct Answer: Option A


Explanation:
Speed = 450 / 30 = 15 m/s. In km/h index = 15 * (18/5) = 54 km/h.

This question belongs to: Maths Time Speed and Distance
Question #2
Walking at 4/5 of his normal pace, an editor reaches his office 15 minutes late. What is his exact normal time to reach the office?
A. 70 minutes
B. 55 minutes
C. 60 minutes
D. 65 minutes

Correct Answer: Option C


Explanation:
New speed = 4/5 of usual speed => New time = 5/4 of usual time. Difference = 1/4 of usual time = 15 minutes. Normal time = 15 * 4 = 60 minutes.

This question belongs to: Maths Time Speed and Distance
Question #3
A boat crew rows 32 km downstream in 2 hours and handles 16 km upstream in 2 hours flat. Find the speed index of the stream current flow.
A. 4.5 km/h
B. 3.5 km/h
C. 5.0 km/h
D. 4.0 km/h

Correct Answer: Option D


Explanation:
Downstream speed = 32 / 2 = 16 km/h. Upstream speed = 16 / 2 = 8 km/h. Speed of current stream flow = (16 - 8) / 2 = 8 / 2 = 4 km/h.

This question belongs to: Maths Time Speed and Distance