A van moves at 45 km/h for 2 hours and then tracks at 55 km/h for the next 3 hours. Find the net average speed for the total route. MCQ with Answer and Explanation

Question

A van moves at 45 km/h for 2 hours and then tracks at 55 km/h for the next 3 hours. Find the net average speed for the total route.

A. 53 km/h

B. 52 km/h

C. 51 km/h

D. 50 km/h

Answer: Option C

Solution (By JKSSB Mock Tests)

Distance 1 = 45 * 2 = 90 km. Distance 2 = 55 * 3 = 165 km. Total distance = 255 km. Total time = 5 hours. Average speed = 255 / 5 = 51 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A civilian steps across a 600-meter long overpass bridge in exactly 5 minutes. Find his speed in km/h.

A. 7.6 km/h

B. 6.8 km/h

C. 8.0 km/h

D. 7.2 km/h

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Correct Answer: Option D

Explanation:
Time = 5 minutes = 300 seconds. Speed = 600 / 300 = 2 m/s. In km/h = 2 * (18/5) = 7.2 km/h.

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Question #2

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A person row a boat 45 km downstream in 3 hours and manages the return journey upstream in 9 hours. Find the speed of the river current.

A. 6.0 km/h

B. 4.5 km/h

C. 5.0 km/h

D. 5.5 km/h

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Correct Answer: Option C

Explanation:
Downstream speed = 45 / 3 = 15 km/h. Upstream speed = 45 / 9 = 5 km/h. Speed of current = (15 - 5) / 2 = 10 / 2 = 5 km/h.

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Question #3

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A person walks from his house to office at 5 km/h and arrives 10 minutes late. If he walks at 6 km/h, he arrives 4 minutes late. Find the distance.

A. 3.5 km

B. 3.0 km

C. 4.0 km

D. 2.5 km

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Correct Answer: Option B

Explanation:
Time difference = 10 - 4 = 6 minutes = 6/60 = 0.1 hours. Let distance be d. d / 5 - d / 6 = 0.1 => d / 30 = 0.1 => d = 3 km.

This question belongs to: Maths Time Speed and Distance

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