- A man can row downstream at the rate of 24 Kmph and upstream at 7 Kmph. Find the manâ€™s rate in still water and rate of current?

A.) 15.5 Kmph, 8.5 Kmph B.) 17 Kmph, 8.5 Kmph C.) 814 Kmph, 7 Kmph D.) None of these Answer: Option 'A'

Rate of still water = 1/2 (down stream + upstream)

= 1/2 (24 + 7) = 15.5 Kmph

rate of current = 1/2 (down stream - upstream)

= 1/2 (24 - 7)

= 1/2 (17)

= 8.5 kmph - A man can row 24 kmph in still water. It takes him thrice as long to row up as to row down the river. Find the rate of the stream?

A.) 4 kmph B.) 12 kmph C.) 6 kmph D.) 1 kmph Answer: Option 'B'

Let man's rate upsteam be X kmph

Then his rate of downstream = 3X kmph

Rate still water = 1/2 (3X + X) = 2X

2X = 24

X = 12

Rate of upstream = 12

Rate of downstream = 36

Rate of stream 1/2 ( 36 - 12) = 12 kmph - In a stream running at 2 Kmph, a motor boat goes 10 Km upstream and back again to the starting point in 55 minutes. Find the speed of motor boat in still water?

A.) 18 kmph B.) 22 kmph C.) 16 kmph D.) 20 kmph Answer: Option 'B'

Let the speed of motor boat instill water be X kmph

Then, speed in downstream = (X + 2) km

and. speed in upstream = (X - 2) kmph

Time taken to row 10km & back = (10/X+2,10/X-2)

10/X+2 + 10/X-2 = 55/60

11X2 - 240X - 44 = 0

(X - 22)(11x + 2) = 0

X = 22 or X = -2/11

Then X = 22 kmph - A man rows to a place 48 Km distance and back in 14 hours. He finds that he can row 4 Km with the stream in the same time 3 Km against the stream. The rate off the stream is?

A.) 1 kmph B.) 2 kmph C.) 1.5 kmph D.) None Answer: Option 'A'

Let be moves 4km downstream in X Hours

Then in speed downstream = Kmph

Speed in upstream = 4/X Kmph

==> 48/4/X + 48/3/X = 14

==> 12X + 16X =14

==> X = 1/2

Speed in downstream = 8 Kmph

Speed in up stream = 6 Kmph

Then the Rate of stream = 1/2 (8 - 6) = 1 Kmph - A man can row 8 Kmph in still water. If the velocity of the current is 2 Kmph and it takes him 2 hours to row to a place and come back. How far is the place?

A.) 6.5 km B.) 7.5 km C.) 7.4 km D.) 6.4 km Answer: Option 'B'

Man's rate down stream = 8 + 2 = 10 kmph

Man's rate upstream = 8 - 2 = 6 kmph

Let the required distance be X km

Then X/10 + X/6 = 2

3X + 5X = 60

8X = 60

X = 7.5 km

Students can learn and improve on their Cognitive and Mathematical Fast Calculation skills and prepare for competitive examinations like...

- All I.B.P.S and Public Sector Bank Competitive Exam
- Common Aptitude Test (CAT) Exams
- UPSC Paper-II or CSAT Exams
- SSC Competitive Exams
- Defence Competitive Exams
- L.I.C / G.I.C AO and Clerk Competitive Exams
- Railway Competitive Exam
- University Grants Commission (UGC)
- Career Aptitude Test (IT Companies) and etc.

For SBI PO Mains - Computer Questions Set - 2

For SBI PO Mains - Computer Questions Set - 1

Current Affairs - SBI PO Mains 2016 Quiz Set - 5

Current Affairs - SBI PO Mains 2016 Quiz Set - 4

Today asked Questions SBI Clerk 2016 25th June 2016

SBI PO Mains Current Affairs Quiz Set - 3

SBI PO Mains Syllogism

SBI PO Mains Seating-Arrangements

SBI PO Mains Current Affairs Quiz Set - 2

SBI PO Mains Current-Affairs Quiz Set - 1

SBI PO Prelims Aptitude Practice Quiz Set - 2

SBI PO Prelims Quant Practice Quiz set - 1

SBI Clerk Mains 2016 - CA Practice Quiz set - 14

SBI Clerk Mains 2016 - CA Practice Quiz set - 13

SBI Clerk Mains 2016 - CA Practice Quiz set - 12

Current Affairs For All Competitive Exams

SBI Clerk Mains 2016 - CA Practice Quiz set - 11

Current Affairs Quiz set - 10 SBI Clerk Mains

Current Affairs Quiz set - 09 SBI Clerk Mains

Cloze Test SBI Clerk mains Practice Test -1

Current Affairs set - 07 SBI Clerk Mains Exam

Line Graph Data Interpretation For SBI Clerk Mains Exam

Aptitude SBI Clerk Mains Exam Practice Test - 1