Boats and Streams MCQ Set 6

Showing question 26 to 30 of total 30 MCQs

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Question No: 26

A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is:

1. 8.5 km/hr
2. 9 km/hr
3. 10 km/hr
4. 12.5 km/hr

Question No: 27

A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively?

1. 2 : 1
2. 3 : 2
3. 8 : 3
4. Cannot be determined

Answer: C

Explanation

Let the man's rate upstream be x kmph and that downstream be y kmph.

Then, distance covered upstream in 8 hrs 48 min = Distance covered downstream in 4 hrs.

Question No: 28

A motorboat, whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hr) is:

1. 4
2. 5
3. 6
4. 10

Answer: B

Explanation

Let the speed of the stream be x km/hr. Then,

Speed downstream = (15 + x) km/hr,

Speed upstream = (15 - x) km/hr.

9x² = 225

x² = 25

x = 5 km/hr.

Question No: 29

In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:

1. 3 km/hr
2. 5 km/hr
3. 8 km/hr
4. 9 km/hr

Question No: 30

A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?

1. 4 km/hr
2. 6 km/hr
3. 8 km/hr
4. Data inadequate