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What is the correct answer?

4

a man can row 18 kmph in still water.it takes him thrice as long to row up as to row down the river. Find the rate of stream.

A. 6 km/hr.

B. 7 km/hr.

C. 8 km/hr.

D. 9 km/hr.

Correct Answer :

D. 9 km/hr.


x=18 or x=9.


Rate upstream=9 km/hr, rate downstream=27 km/hr.


Hence, rate of stream=1/2(27-9)km/hr=9 km/hr.

Related Questions

What is the correct answer?

4

A man can row upstream at 8 kmph and downstream at 13 kmph. The speed of the stream is:

A. 2.5 km/hr

B. 4.2 km/hr

C. 5 km/hr

D. 10.5 km/hr

What is the correct answer?

4

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

A. 2:1

B. 3:2

C. 8:3

D. None of these

What is the correct answer?

4

A man takes twice as long to row a distance against the stream as to row  the same distance in favour of the stream. The ratio of the speed of the boat (in still water) and the stream is:

A. 2:1

B. 3:1

C. 3:2

D. 4:3

What is the correct answer?

4

A boat man goes 2 km against the current of the stream in 1 hr and goes 1 km along the current in 10 minites. How long will it take to go 5 km in stationary water?

A. 40 minutes

B. 1 hours

C. 1 hr 15 min

D. 1 hr 30 min

What is the correct answer?

4

A man can row upstream at 7 kmph and downstream at 10kmph.find man’s rate in still water and the rate of current.

A. 1 km/hr.

B. 1.5 km/hr.

C. 3.2 km/hr.

D. 3.5 km/hr.

What is the correct answer?

4

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

A. 4 km/hr

B. 6 km/hr

C. 8 km/hr

D. Data inadequate

What is the correct answer?

4

a man can row 18 kmph in still water.it takes him thrice as long to row up as to row down the river. Find the rate of stream.

A. 6 km/hr.

B. 7 km/hr.

C. 8 km/hr.

D. 9 km/hr.

What is the correct answer?

4

A man can row 7 ½ kmph in still water. If in a river running at 1.5 km/hr an hour, it takes him 50 minutes to row to a place and back, how far off is the place?

A. 2 km

B. 3 km

C. 4km

D. 5km

What is the correct answer?

4

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

A. 3

B. 5

C. 8

D. 9

What is the correct answer?

4

A man takes 3 hours 45 minutes to row a boat 15 km downstream of a river and 2hours30minutes to cover a distance of 5km upstream. find the speed of the river current in km/hr.

A. 1km/hr

B. 2km/hr

C. 3km/hr

D. 4km/hr

What is the correct answer?

4

A man can row downstream 32 km and upstream 14 km. If he takes 6 hr to cover each distance , then the velocity(in kmph) of the current is:

A. 12

B. 1

C. 32

D. 2

What is the correct answer?

4

A man can row 40km upstream and 55km downstream in 13 hours also, he can row 30km upstream and 44km downstream in 10 hours. Find the speed of the man in still water and the speed of the current.

A. 5 km/hr

B. 4 km/hr

C. 3 km/hr

D. 1km/hr

What is the correct answer?

4

A man can row three-quarters of a kilometre against the stream in 1114 min. The speed (in km/hr) of the man in still water is:

A. 2

B. 3

C. 4

D. 5

What is the correct answer?

4

In a stream running at 2kmph,a motor boat goes 6km upstream and back again to the starting point in 33 minutes. Find the speed of the motorboat in still water.

A. 18 km/hr

B. 23 km/hr

C. 22 km/hr

D. 28 km/hr