A private sedan tracks a sector path length of 360 km in 4 hours 30 minutes. Find its mean average speed index. MCQ with Answer and Explanation

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A private sedan tracks a sector path length of 360 km in 4 hours 30 minutes. Find its mean average speed index.

A. 90 km/h

B. 75 km/h

C. 80 km/h

D. 85 km/h

Answer: Option C

Solution (By JKSSB Mock Tests)

Time = 4.5 hours. Speed index = Sector Distance / Time = 360 / 4.5 = 80 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A boat covers 30 km downstream in 3 hours and the same distance upstream in 6 hours. Find the speed of the stream.

A. 2.5 km/h

B. 3.5 km/h

C. 3.0 km/h

D. 2.0 km/h

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Correct Answer: Option A

Explanation:
Downstream speed = 30 / 3 = 10 km/h. Upstream speed = 30 / 6 = 5 km/h. Speed of stream = (10 - 5) / 2 = 5 / 2 = 2.5 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A car travels a distance of 240 km at a certain speed. If the speed is increased by 10 km/h, it takes 4 hours for the journey. Find the original speed.

A. 50 km/h

B. 45 km/h

C. 60 km/h

D. 55 km/h

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Correct Answer: Option A

Explanation:
New speed = 240 / 4 = 60 km/h. Since new speed is original speed + 10 km/h, the original speed = 60 - 10 = 50 km/h.

This question belongs to: Maths Time Speed and Distance

Question #3

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A boat crew rows 24 km downstream in 3 hours and logs the same route track upstream in 6 hours. Find the speed of the boat hull in still water.

A. 7 km/h

B. 8 km/h

C. 5 km/h

D. 6 km/h

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Correct Answer: Option D

Explanation:
Downstream speed = 24 / 3 = 8 km/h. Upstream speed = 24 / 6 = 4 km/h. Speed in still water = (8 + 4) / 2 = 6 km/h.

This question belongs to: Maths Time Speed and Distance

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