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Quantitative Aptitude-Tricks &Explanations-Boat & Stream

Quantitative Aptitude-Tricks &Explanations-Boat & Stream

 

Dear Readers, Topic Wise Aptitude questions for Competitive Exam was given here. Aspirants those Who are preparing for the examination can use this.

Q.A-Topic Wise Questions –Boat & Stream-Set 1

1)The speed of boat in still water is 16 km/hr & the speed of current is 4 km/hr. It takes a total of 7.5 hours to row upstream from point P to Q and downstream from point Q to R. If the distance between P & R is one-fifth the distance between Q & R then what is the difference between Q to R (in km)?
A)97
B)42.23
C)84
D)48
E)None of these
2)A boat can travel 10.8 km downstream in 27 minutes & 9.6 km upstream in 32 minutes. What is the total time taken by the boat to travel 48 km upstream and the same distance downstream together ?
A)3 hrs 30 min
B)4 hrs 15 min
C)4 hrs 40 min
D)4 hrs 25 min
E)None of these
3)The speed of a boat in still water is 22 km/hr & the speed of the stream is 2 km/hr .The time taken by the boat to travel from P to Q downstream is 32 minutes less than the time taken by the same boat to travel from Q to R upstream. If the distance between P & Q is 6 km more than the distance between
Q & R , what is the distance between P & Q (in km) ?
A)150
B)100
C)175
D)200
E)None of these
4)A boat takes 19 hours to travel downstream from point A to point B & coming back to point C midway between A & B .If the speed of the stream is 4 km/hr and the speed of the boat in still water is 14 km/hr, what is the distance between A & B ?
A)200 km
B)180 km
C)160 km
D)220 km
E)None of these
5) A man swims at 16 km/hr instill water . If the river is flowing at 5 km/hr , it takes 10 hours more to go upstream than to go the same distance downstream. How far is the place ?
A)231 km
B)221 km
C)251 km
D)241 km
E)None of these

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Ans.

1.E-50)
Let the distance from Q to R is =X km
So P to R = x/5 Km
According to question
{X/(16+4) }+ {(x/5)/(16-4)}=7.5
X=50 km.

2.C-4 hrs 40 min)
DN speed = 24 km/hr
UP speed=18 km/hr
According to question
Reqd time=48/24 + 48/18=4 hrs 40 min

3.B-100 )
Let the distance between Q & R be X km & the distance P & Q be (x+6) km
According to question
(x/20) – (x+6)/24= 32/60
X=94 km
Distance between P & Q = (94+6)= 100 km

4.B-180 km)
Let the total distance be X km
According to question
X/(14+4) + (X/2)/(14-4)=19
X=180 km

5.A-231 km)
Let the distance be X km
According to question
X/(16-5) –X/(16+5) =10
X= 231 km
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