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. MCQ with Answer and Explanation

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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. 40 km/h

B. 48 km/h

C. 45 km/h

D. 42 km/h

Answer: Option D

Solution (By JKSSB Mock Tests)

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

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Question #1

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Two commuter trains 130 meters and 120 meters long are tracking in opposite directions at speeds of 42 km/h and 48 km/h respectively. In what time will they clear each other?

A. 10 seconds

B. 11 seconds

C. 9 seconds

D. 12 seconds

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Correct Answer: Option A

Explanation:
Total distance = 130 + 120 = 250 meters. Relative speed in opposite directions = 42 + 48 = 90 km/h = 90 * (5/18) = 25 m/s. Time required = 250 / 25 = 10 seconds.

This question belongs to: Maths Time Speed and Distance

Question #2

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A schoolboy covers his walk to school at 4 km/h and arrives 9 minutes late. The next day, he steps up his pace to 6 km/h and arrives 1 minute early. Find the distance.

A. 2.2 km

B. 2.0 km

C. 1.8 km

D. 2.5 km

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Correct Answer: Option B

Explanation:
Time difference = 9 - (-1) = 10 minutes = 10/60 = 1/6 hours. Let distance be d. d/4 - d/6 = 1/6 => d/12 = 1/6 => d = 2 km.

This question belongs to: Maths Time Speed and Distance