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Boats & Streams

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91.

A boat goes 6 km in an hour in still water. It takes thrice as much time in covering the same distance against the current. Speed of the current is?

Answer: C

Speed in still water = 6 km/hr 

 

Speed against the current = 6/3 km/hr = 2 km/hr 

 

Let the speed of the current be x km/hr 

 

6-x = 2 => x =4 km/hr

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92.

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?

Answer: C

No answer description available for this question.

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93.

A boat is rowed downstream at 15.5km/hr and upstream at 8.5 km/hr. The speed of the stream is?

Answer: A

Speed Downstream = 15.5 km/hr, 

 

speed upstream = 8.5 km/hr 

 

Speed of the stream = ½ (15.5 – 8.5)km = 3.5 km/hr

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94.

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:

Answer: B

No answer description available for this question.

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95.

A man's speed with the current is 20 kmph and speed of the current is 3 kmph. The Man's speed against the current will be

Answer: C

Speed with current is 20,

speed of the man + It is speed of the current

Speed in still water = 20 - 3 = 17

Now speed against the current will be

speed of the man - speed of the current

= 17 - 3 = 14 kmph

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96.

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:

Answer: B

No answer description available for this question.

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97.

A man rows 750 m in 675 seconds against the stream and returns in 7 and half minutes. His rowing speed in still water is

Answer: B

Rate upstream = (750/675) = 10/9 m/sec

Rate downstream (750/450) m/sec = 5/3 m/sec

Rate in still water = (1/2)*[(10/9) + (5/3)] m/sec.

= 25/18 m/sec

= (25/18) × (18/5) kmph

= 5 kmph

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98.

A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water?

Answer: C

No answer description available for this question.

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99.

A boat running upstream takes 8 hours 48 min 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 the speed of water current respectively?

Answer: C

Let the speed of boat be x km/hr and speed of stream be ykm/hr. 

 

44/5 × (x -y) = 4x (x +y) 

 

=> 44(x-y) = 20 (x+y) 

 

 =>11 (x-y) = 5 (x +y) 

 

 => 6x =16 y 

 

 => x/y = 16/6 = 8/3 

 

 => x : y = 8 : 3

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100.

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:

Answer: A

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