C-03-Q180mediumsingle_mcq

Boatman covers $d$ km against current in $p$ hr, along current in $q$ hr. Speed of boat = ?

a $\dfrac{d}{2}\left(\dfrac{1}{p} + \dfrac{1}{q}\right)$
b $\dfrac{d}{2}\left(\dfrac{1}{p} - \dfrac{1}{q}\right)$
c $\dfrac{d}{2}\left(\dfrac{1}{q} - \dfrac{1}{p}\right)$
d $d(p+q)$

ব্যাখ্যা

Upstream gives $\dfrac{d}{p}=b-c$ and downstream $\dfrac{d}{q}=b+c$ ; averaging the two eliminates the current, so $b = \dfrac{d}{2}\left(\dfrac{1}{p}+\dfrac{1}{q}\right)$ .

এই অধ্যায়ের আরও প্রশ্ন

Algebraic Expressions — সব প্রশ্ন দেখুন (219টি) →

Boatman covers $d$ km against current in $p$ hr, along current in $q$ hr. Speed of boat = ?

\dfrac{d}{2}\left(\dfrac{1}{p} + \dfrac{1}{q}\right)

\dfrac{d}{2}\left(\dfrac{1}{p} - \dfrac{1}{q}\right)

\dfrac{d}{2}\left(\dfrac{1}{q} - \dfrac{1}{p}\right)

d(p+q)

ব্যাখ্যা

Upstream gives $\dfrac{d}{p}=b-c$ and downstream $\dfrac{d}{q}=b+c$ ; averaging the two eliminates the current, so $b = \dfrac{d}{2}\left(\dfrac{1}{p}+\dfrac{1}{q}\right)$ .

Boatman covers ddd km against current in ppp hr, along current in qqq hr. Speed of boat = ?

ব্যাখ্যা

এই অধ্যায়ের আরও প্রশ্ন

Boatman covers ddd km against current in ppp hr, along current in qqq hr. Speed of boat = ?

ব্যাখ্যা

এই অধ্যায়ের আরও প্রশ্ন

Boatman covers $d$ km against current in $p$ hr, along current in $q$ hr. Speed of boat = ?

Boatman covers $d$ km against current in $p$ hr, along current in $q$ hr. Speed of boat = ?