A vessel tracks upstream at 10 km/h and downstream at 18 km/h. Find the net speed of the river current. MCQ with Answer and Explanation
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Question #1
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A car travels a distance of 420 km at a certain speed. If the speed is increased by 15 km/h, it takes 5 hours for the journey. Find the original speed.
Correct Answer: Option D
Explanation:
New speed = 420 / 5 = 84 km/h. Since new speed is original speed + 15 km/h, the original speed = 84 - 15 = 69 km/h.
New speed = 420 / 5 = 84 km/h. Since new speed is original speed + 15 km/h, the original speed = 84 - 15 = 69 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A boat crew row a boat 24 km downstream in 3 hours and tracks the identical loop back upstream in 6 hours. Find the baseline speed of the boat in still water.
Correct Answer: Option A
Explanation:
Downstream tracking speed = 24 / 3 = 8 km/h. Upstream tracking speed = 24 / 6 = 4 km/h. Speed in still water = (8 + 4) / 2 = 12 / 2 = 6 km/h.
Downstream tracking speed = 24 / 3 = 8 km/h. Upstream tracking speed = 24 / 6 = 4 km/h. Speed in still water = (8 + 4) / 2 = 12 / 2 = 6 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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Excluding stoppages, the speed of a regional transit bus is 48 km/h and including stoppages it is 40 km/h. For how many minutes does the bus stop per hour?
Correct Answer: Option B
Explanation:
Stoppage time per hour = (48 - 40) / 48 = 8 / 48 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.
Stoppage time per hour = (48 - 40) / 48 = 8 / 48 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.
This question belongs to:
Maths
Time Speed and Distance
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