A motorboat tracks 36 km downstream in 3 hours and spans the same stretch upstream in 4.5 hours. Find the speed of the current. MCQ with Answer and Explanation

Question

A motorboat tracks 36 km downstream in 3 hours and spans the same stretch upstream in 4.5 hours. Find the speed of the current.

A. 2.0 km/h

B. 1.5 km/h

C. 3.0 km/h

D. 2.5 km/h

Answer: Option A

Solution (By JKSSB Mock Tests)

Downstream speed = 36 / 3 = 12 km/h. Upstream speed = 36 / 4.5 = 8 km/h. Speed of current = (12 - 8) / 2 = 4 / 2 = 2 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A wheel has a radius of 14 cm. How many revolutions must it make to cover a distance of 88 meters?

A. 150

B. 80

C. 120

D. 100

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Correct Answer: Option D

Explanation:
Circumference of the wheel = 2 * (22/7) * 14 = 88 cm = 0.88 meters. Total distance = 88 meters. Number of revolutions = 88 / 0.88 = 100.

This question belongs to: Maths Time Speed and Distance

Question #2

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A vehicle runs at 30 km/h for 3 hours and 60 km/h for the next 2 hours. Find the average speed for the whole journey.

A. 48 km/h

B. 45 km/h

C. 42 km/h

D. 40 km/h

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Correct Answer: Option C

Explanation:
Distance 1 = 30 * 3 = 90 km. Distance 2 = 60 * 2 = 120 km. Total distance = 210 km. Total time = 3 + 2 = 5 hours. Average speed = 210 / 5 = 42 km/h.

This question belongs to: Maths Time Speed and Distance