LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
9 views
in Aptitude by (30.0k points)
closed by
If the speed of a boat in stationary water is 28 km/h and the speed of the stream is 10 km/h. Distance covered by boat in the direction along the stream is 342 km and return back. Find the total time taken.
1. 28 hours
2. 5 hours 
3. 15 hours
4. 20 hours

1 Answer

0 votes
by (54.3k points)
selected by
 
Best answer
Correct Answer - Option 1 : 28 hours

Given

Speed of boat = 28 km/h

Speed of stream = 10 km/h

Formula used

Downstream speed = (Speed of boat + Speed of stream)

Upstream speed = (Spees of boat - Speed of stream)

Time = Distance/Speed

Calculation

Downstream speed = (28 + 10)

⇒ 38 km/h

Upstream speed = (28 - 10)

⇒ 18 km/h

Time = (342/38) + (342/18)

⇒ 9 + 19

⇒ 28 hours

∴ Total time taken is 28 hours.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...