Aptitude - Speed of boat in still water 10 kmph.If the boat takes 24hr in up stream and 16hr in down stream to

GeekInterview.com > Placement Papers > IBM > Aptitude

Go To First | Previous Question | Next Question

Aptitude | Question 10 of 124

Speed of boat in still water 10 kmph.If the boat takes 24hr in up stream and 16hr in down stream to cross the same distance, then what will be the distance covered.

Total Answers and Comments: 8

Last Update: June 14, 2008

Sponsored Links

Best Rated Answer

—

Submitted by: nmodi

Ans. 384 Kms.
Speed of boat = 10 Kmph;
Let speed of river = x;
Relative speed of boat in upstream = 10 - x;
Relative speed of boat in downstream = 10 + x;
Since, Distance = Velocity * Time;
Distance upstream = (10 - x) * 24;
Distance downstream = (10 + x) * 16;
Distance upstream = Distance downstream;
(10 - x) * 24 = (10 + x) * 16;
therefore x = 2;
Total distance = distance upstream + distance downstream;
Total distance = (10 - x) * 24 + (10 + x) * 16;
Total distance = 8 * 24 + 12 * 16 = 192 + 192 =384 Km

Above answer was rated as good by the following members:
jasu85, anjali_aiet

May 19, 2005 04:12:54

harry

RE: Speed of boat in still water 10 kmph.If the boat takes 24hr in up stream and 16hr in down stream to ...

192

Is this answer useful? Yes | No

0 1

Overall Rating: -1

June 11, 2005 21:25:22

peter

RE: Speed of boat in still water 10 kmph.If the boat takes 24hr in up stream and 16hr in down stream to ...

200

Is this answer useful? Yes | No

0 1

Overall Rating: -1

July 17, 2005 11:49:19

nmodi

RE: Speed of boat in still water 10 kmph.If the boat takes 24hr in up stream and 16hr in down stream to ...

Ans. 384 Kms.
Speed of boat 10 Kmph;
Let speed of river x;
Relative speed of boat in upstream 10 - x;
Relative speed of boat in downstream 10 + x;
Since Distance Velocity * Time;
Distance upstream (10 - x) * 24;
Distance downstream (10 + x) * 16;
Distance upstream Distance downstream;
(10 - x) * 24 (10 + x) * 16;
therefore x 2;
Total distance distance upstream + distance downstream;
Total distance (10 - x) * 24 + (10 + x) * 16;
Total distance 8 * 24 + 12 * 16 192 + 192 384 Km

Is this answer useful? Yes | No

1 0

Overall Rating: +1

July 27, 2005 06:41:52

nimmi

RE: Speed of boat in still water 10 kmph.If the boat takes 24hr in up stream and 16hr in down stream to ...

speed in still water 0.5(speed upstream+speed downstream)
let distance be x kms.
0.5((x/24)+(x/16)) 10
solving distance x 192.

Is this answer useful? Yes | No

1 0

Overall Rating: +1

February 19, 2006 13:57:05

jaspreet(jagz)

RE: Speed of boat in still water 10 kmph.If the...

D 16(10+x) 24(10-x) // D is the distance traveeled.. and x is the speed of the stream)....... >x 2 kmphthus D 192 km

Is this answer useful? Yes | No

August 04, 2006 14:34:01

nilu

RE: Speed of boat in still water 10 kmph.If the...

192(right ans)

Is this answer useful? Yes | No

December 07, 2006 03:46:16

vishwa828

Member Since: December 2006 Contribution: 7

RE: Speed of boat in still water 10 kmph.If the...

hey the answer shoud be 192+192 384 since he asked for the distance covered....

Is this answer useful? Yes | No

June 14, 2008 02:25:42

imran4108_4u

Member Since: June 2008 Contribution: 3

RE: Speed of boat in still water 10 kmph.If the boat takes 24hr in up stream and 16hr in down stream to cross the same distance, then what will be the distance covered.

speed of boat in still water 10kmph
speed of upstream d/24
speed downstream d/16

speed of boat in still water 1/2(speed upstream+speed downstream)
10 1/2(d/24+d/16)

d 192 km

Is this answer useful? Yes | No

Go To Top

User Name		Remember Me?
Password

Question Bank