Boats And Streams(Quantitative Aptitude ) Questions and answers for exam Preparation

Quantitative Aptitude

BOATS AND STREAMS MCQs

Total Questions : 948 | Page 89 of 95 pages

Question 881. A man can row upstream at 12km/hr and downstream at 18 km/hr. The man rowing speed in still water is?

15 km/hr
5 km/hr
3 km/hr
10 km/hr

Discuss Question

Answer: Option A. -> 15 km/hr
Speed of boat in still water = $$\frac{{x + y}}{2}$$
Where (x = downstream speed) and (y = upstream speed)
∴ Boat's speed
$$\eqalign{
& {\text{ = }}\frac{{18 + 12}}{2} \cr
& = \frac{{30}}{2} \cr
& = 15\,km/hr \cr} $$

Question 882.
A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.

2 hours
3 hours
4 hours
5 hours

Discuss Question

Answer: Option C. -> 4 hours

Question 883. 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:

3 km/hr
5 km/hr
8 km/hr
9 km/hr

Discuss Question

Answer: Option C. -> 8 km/hr

Question 884.
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?

2 : 1
3 : 2
8 : 3
None of these

Discuss Question

Answer: Option C. -> 8 : 3

Question 885. 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:

8.5 km/hr
9 km/hr
10 km/hr
12.5 km/hr

Discuss Question

Answer: Option C. -> 10 km/hr

Question 886. 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:

Discuss Question

Answer: Option B. -> 5

Question 887. The speed of a boat in still water in 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is:

1.2 km
1.8 km
2.4 km
3.6 km

Discuss Question

Answer: Option D. -> 3.6 km

Question 888. 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?

4 km/hr
6 km/hr
8 km/hr
Data inadequate

Discuss Question

Answer: Option B. -> 6 km/hr

Question 889. A boat takes 90 minutes less to travel 36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 mph, the speed of the stream is:

2 mph
2.5 mph
3 mph
4 mph

Discuss Question

Answer: Option A. -> 2 mph

Question 890. . A boat takes a total time of three hours to travel downstream from P and Q and upstream back from Q to P. What is the speed of the boat in still water?
I. The speed of the river current is 1 km per hour.
II. The distance between P and Q is 4 km.