A boat can row 12 km/h in still water. If the current marks 3 km/h, find the distance covered downstream by the boat in exactly 40 minutes. MCQ with Answer and Explanation

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A boat can row 12 km/h in still water. If the current marks 3 km/h, find the distance covered downstream by the boat in exactly 40 minutes.

A. 10 km

B. 12 km

C. 9 km

D. 11 km

Answer: Option A

Solution (By JKExamLibrary)

Downstream speed = 12 + 3 = 15 km/h. Time = 40 minutes = 40/60 = 2/3 hours. Distance = Speed * Time = 15 * (2/3) = 10 km.

This question belongs to: Maths Time Speed and Distance

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Practice More Time Speed and Distance Questions

Question #1 Report Error

A train leaves a station at 4:00 PM and travels at an average speed of 60 km/h. Another train leaves the same station at 5:00 PM in the same direction at an average speed of 80 km/h. At what time will the second train catch up with the first train?

A. 7:00 PM

B. 8:30 PM

C. 8:00 PM

D. 9:00 PM

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
By 5:00 PM, the first train has traveled for 1 hour and covered 60 km. Relative speed = 80 - 60 = 20 km/h. Time needed to catch up = 60 / 20 = 3 hours. Catch up time = 5:00 PM + 3 hours = 8:00 PM.

This question belongs to: Maths Time Speed and Distance

Question #2 Report Error

If a man walks at 12 km/h instead of 9 km/h, he travels 15 km more in the same time. Find the actual distance traveled by him.

A. 35 km

B. 60 km

C. 50 km

D. 45 km

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
Let the time duration be t hours. Difference in distance = 12t - 9t = 3t = 15 km => t = 5 hours. Actual distance traveled = 9 * 5 = 45 km.

This question belongs to: Maths Time Speed and Distance