Question
A boat can go 15 km upstream and 21 km downstream in 2
hours. If the speed of the stream is 3 km/h, then the time taken (in hours) by the boat to go 21 km upstream and 15 km downstream is:Solution
Let the speed of boat in still water =B
Let the speed of stream in still water =S
Speed of boat in downstream =B+S
Speed of boat in upstream =B-S
B+S=21/2=10.5km/h
B-S=15/2=7.5km/h
Solving after –
B=9km/h and S=1.5km/h
ATQ-
S =1.5 =3km/h
B=9=18 km/h
Now total taken time =
(21/B-S) +(15/B+S)
= (21/15) +(15/21)
=74/35
=2(4/35) hours
Select the phrase/connector from the given three options which can be used to form a single sentence from the two sentences given below, implying the s...
Select the phrase(s) from the given three options which can be used to form a single sentence from the two sentences given below, implying the same mean...
In each of the questions given below, two statements are provided followed by three possible starters (I, II, III). Identify the alternative(s) that ca...
In the questions below, three sentences are given followed by four connectors. From the options below, choose the one that provides the correct combina...
With the increasing (A) demand for urea from paddy farmers following the exuded (B) rains, officials have recent (C) confidence about supplying the adeq...
Select the phrase(s) from the given three options which can be used to form a single sentence from the two sentences given below, implying the same mean...
Choose the rightly punctuated sentence from the choices given below
Select the phrase/connector from the given three options which can be used to form a single sentence from the two sentences given below, implying the s...
I was unwilling to go any further. I returned home.
(I) Returning home
(II) Though unwilling to return
(III) Unwilling to go
In the question below, three sentences are given followed by four connectors. From the options below, choose the one that provides the correct combinat...
