Aspire's Library

A Place for Latest Exam wise Questions, Videos, Previous Year Papers,
Study Stuff for MCA Examinations
  • NIMCET
    Previous Year Questions

NIMCET Previous Year Questions (PYQs)

NIMCET Boat And Stream PYQ

NIMCET PYQ
A motorboat going downstream passes a raft at point A. Exactly one hour later it turned back and while coming upstream it passed the same raft at point B, 6 km from point A. What is the speed of the water current in km/hr?





Go to Discussion
NIMCET Previous Year PYQ NIMCET NIMCET 2009 PYQ

Solution

Let:
Boat speed in still water = v
Current speed = c

Downstream speed = v + c
Upstream speed = v – c

Key observation:
In 1 hour, the raft (moving with the current) travels c × 1 = c km from A.

Distance between A and B = 6 km
So during the entire boat cycle, the raft moved 6 km purely due to current.

Time taken by boat after passing raft until it meets again:
Downstream for 1 hour + Upstream time (t)
Raft moves 6 km in this total time:

c × (1 + t) = 6 … (i)

Distance boat travels upstream:
(v + c) × 1 = (v – c) × t + 6

But using standard result of this classic problem:
Current speed = distance / 2
= 6 / 2
= 3 km/hr

NIMCET

Online Test Series,
Information About Examination,
Syllabus, Notification
and More.

Click Here to
View More

NIMCET

Online Test Series,
Information About Examination,
Syllabus, Notification
and More.

Click Here to
View More
Ask Your Question or Put Your Review.

loading...