A person covers a distance of 120 km at 30 km/h and another 80 km at 40 km/h. Find his average speed for the full journey. MCQ with Answer and Explanation

Question

A person covers a distance of 120 km at 30 km/h and another 80 km at 40 km/h. Find his average speed for the full journey.

A. 35.0 km/h

B. 34.5 km/h

C. 33.33 km/h

D. 32.2 km/h

Answer: Option C

Solution (By JKSSB Mock Tests)

Total distance = 120 + 80 = 200 km. Time 1 = 120 / 30 = 4 hours. Time 2 = 80 / 40 = 2 hours. Total time = 6 hours. Average speed = 200 / 6 = 33.33 km/h.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A cyclist covers a 1500-meter course in 5 minutes. Find his speed in km/h.

A. 15 km/h

B. 24 km/h

C. 20 km/h

D. 18 km/h

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Correct Answer: Option D

Explanation:
Time = 5 minutes = 300 seconds. Speed = 1500 / 300 = 5 m/s. Converting to km/h = 5 * (18/5) = 18 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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The speeds of three cars are in the ratio 2 : 3 : 4. What is the ratio of time taken by these cars to travel the same distance?

A. 12 : 8 : 6

B. 2 : 3 : 4

C. 6 : 4 : 3

D. 4 : 3 : 2

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Correct Answer: Option C

Explanation:
Ratio of times is the inverse of the ratio of speeds: 1/2 : 1/3 : 1/4. Multiplying by the LCM (12), we get 6 : 4 : 3.

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Question #3

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Excluding stoppages, the speed of a bus is 55 km/h and including stoppages it is 44 km/h. For how many minutes does the bus stop per hour?

A. 14 minutes

B. 10 minutes

C. 12 minutes

D. 15 minutes

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Correct Answer: Option C

Explanation:
Stoppage time per hour = (55 - 44) / 55 = 11 / 55 = 1/5 hour. In minutes = (1/5) * 60 = 12 minutes.

This question belongs to: Maths Time Speed and Distance

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