A boatman can row 12 km/h in still water. If the river velocity index tracks at 2 km/h, find the time parameter required by the boat hull to row 40 km upstream. MCQ with Answer and Explanation
Question
Report Error
Discuss this Question (0)
Practice More Time Speed and Distance Questions
Question #1
Report Error
A man walks from his residence to a focal point at 4 km/h and arrives 10 minutes late. If he increases his speed to 5 km/h, he arrives 2 minutes early. Find the distance.
Correct Answer: Option C
Explanation:
Time difference = 10 - (-2) = 12 minutes = 12/60 = 0.2 hours. Let distance be d. d / 4 - d / 5 = 0.2 => d / 20 = 0.2 => d = 4 km.
Time difference = 10 - (-2) = 12 minutes = 12/60 = 0.2 hours. Let distance be d. d / 4 - d / 5 = 0.2 => d / 20 = 0.2 => d = 4 km.
This question belongs to:
Maths
Time Speed and Distance
Question #2
Report Error
A person row a boat 45 km downstream in 3 hours and manages the return journey upstream in 9 hours. Find the speed of the river current.
Correct Answer: Option A
Explanation:
Downstream speed = 45 / 3 = 15 km/h. Upstream speed = 45 / 9 = 5 km/h. Speed of current = (15 - 5) / 2 = 10 / 2 = 5 km/h.
Downstream speed = 45 / 3 = 15 km/h. Upstream speed = 45 / 9 = 5 km/h. Speed of current = (15 - 5) / 2 = 10 / 2 = 5 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
Report Error
The speed of a boat in still water is 15 km/h and the speed of the current is 3 km/h. Distance traveled downstream in 12 minutes is:
Correct Answer: Option B
Explanation:
Downstream speed = 15 + 3 = 18 km/h. Time = 12 minutes = 12/60 = 0.2 hours. Distance = Speed * Time = 18 * 0.2 = 3.6 km.
Downstream speed = 15 + 3 = 18 km/h. Time = 12 minutes = 12/60 = 0.2 hours. Distance = Speed * Time = 18 * 0.2 = 3.6 km.
This question belongs to:
Maths
Time Speed and Distance
No comments yet. Be the first to start the discussion!