A person covers 20 km at 5 km/h and another 40 km at 10 km/h. Find his average speed for the entire journey. MCQ with Answer and Explanation

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A person covers 20 km at 5 km/h and another 40 km at 10 km/h. Find his average speed for the entire journey.

A. 6.66 km/h

B. 8.5 km/h

C. 7.5 km/h

D. 8 km/h

Answer: Option C

Solution (By JKSSB Mock Tests)

Total distance = 20 + 40 = 60 km. Total time = 20/5 + 40/10 = 4 + 4 = 8 hours. Average speed = 60 / 8 = 7.5 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A boat moves upstream at a pace of 10 km/h and handles downstream at 16 km/h. Find the speed of the river current.

A. 3.0 km/h

B. 4.0 km/h

C. 2.5 km/h

D. 3.5 km/h

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Correct Answer: Option A

Explanation:
Speed of river current = (Downstream speed - Upstream speed) / 2 = (16 - 10) / 2 = 6 / 2 = 3 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A boat can row 10 km/h in still water. If the river velocity is 2 km/h, find the distance covered downstream by the boat in 30 minutes.

A. 5 km

B. 7 km

C. 8 km

D. 6 km

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Correct Answer: Option D

Explanation:
Downstream speed = 10 + 2 = 12 km/h. Time = 30 minutes = 0.5 hour. Distance covered = Speed * Time = 12 * 0.5 = 6 km.

This question belongs to: Maths Time Speed and Distance

Question #3

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A train 160 meters long completely passes a static pole in 8 seconds. Find its speed in km/h.

A. 80 km/h

B. 64 km/h

C. 72 km/h

D. 84 km/h

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Correct Answer: Option C

Explanation:
Speed = 160 / 8 = 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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