A boat rowed upstream measures 12 km/h and downstream measures 20 km/h. Find the speed of the boat hull in still water. MCQ with Answer and Explanation

A boat rowed upstream measures 12 km/h and downstream measures 20 km/h. Find the speed of the boat hull in still water.
A. 15 km/h
B. 16 km/h
C. 18 km/h
D. 17 km/h
Answer: Option B
Solution (By JKSSB Mock Tests)
Speed in still water = (Downstream speed + Upstream speed) / 2 = (20 + 12) / 2 = 16 km/h.

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Practice More Time Speed and Distance Questions

Question #1
A motorboat rows 24 km downstream in 3 hours and tracks the identical route upstream back to the jetty point in 4 hours. Find the net speed index of the current stream flow.
A. 1.2 km/h
B. 1.0 km/h
C. 1.5 km/h
D. 0.8 km/h

Correct Answer: Option B


Explanation:
Downstream speed = 24 / 3 = 8 km/h. Upstream speed = 24 / 4 = 6 km/h. Speed of current stream flow = (8 - 6) / 2 = 2 / 2 = 1.0 km/h.

This question belongs to: Maths Time Speed and Distance
Question #2
A person covers a distance of 100 km at 25 km/h and another 150 km at 50 km/h. Find his average speed for the whole journey.
A. 35.71 km/h
B. 37.50 km/h
C. 38.25 km/h
D. 35.5 km/h

Correct Answer: Option A


Explanation:
Total distance = 100 + 150 = 250 km. Total time taken = 100/25 + 150/50 = 4 + 3 = 7 hours. Average speed = 250 / 7 = 35.71 km/h.

This question belongs to: Maths Time Speed and Distance
Question #3
A train passes a static post in 12 seconds. If the speed of the train is 60 km/h, what is the length of the train?
A. 200 meters
B. 180 meters
C. 220 meters
D. 240 meters

Correct Answer: Option A


Explanation:
Speed of train = 60 * (5/18) = 50/3 m/s. Length of train = Speed * Time = (50/3) * 12 = 200 meters.

This question belongs to: Maths Time Speed and Distance