A train 120 meters long completely passes a static pole in 6 seconds. Find its speed in km/h. MCQ with Answer and Explanation

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A train 120 meters long completely passes a static pole in 6 seconds. Find its speed in km/h.

A. 72 km/h

B. 64 km/h

C. 84 km/h

D. 80 km/h

Answer: Option A

Solution (By JKSSB Mock Tests)

Speed = 120 / 6 = 20 m/s. In km/h = 20 * (18/5) = 72 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A pedestrian walks at a constant pace of 5 km/h. How many meters can he cover in exactly 18 minutes?

A. 1400 meters

B. 1600 meters

C. 1800 meters

D. 1500 meters

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Correct Answer: Option D

Explanation:
Speed = 5 km/h = 5000 meters / 60 minutes = 83.33 meters per minute. Distance in 18 minutes = 83.33 * 18 = 1500 meters.

This question belongs to: Maths Time Speed and Distance

Question #2

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A vehicle covers a lap distance of 450 km at a uniform speed. If its velocity is cut by 15 km/h, the trip maps 1.5 hours longer. Find the original speed.

A. 90 km/h

B. 80 km/h

C. 60 km/h

D. 75 km/h

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Correct Answer: Option D

Explanation:
Let original speed be s. 450/(s-15) - 450/s = 1.5 => 300/(s-15) - 300/s = 1 => 300(15) = s(s-15) => 4500 = s(s-15). Solving s^2 - 15s - 4500 = 0 gives (s-75)(s+60) = 0. Baseline speed = 75 km/h.

This question belongs to: Maths Time Speed and Distance