Time, Speed & Distance
Aptitude

 Back to Questions
Q.

$P$ and $Q$ travels from $D$ to $A$ and break journey at $M$ in between. Somewhere between $D$ and $M$, $P$ asks "how far have we travelled?" $Q$ replies, "Half as far as the distance from here to $M$". Somewhere between $M$ and $A$, exactly 300 km from the point where $P$ asks the first question, "How far have we to go?" $Q$ replies, "Half as far as the distance from $M$ to here". The distance between $D$ and $A$ is:

 A.

250 km

 B.

350 km

 C.

450 km

 D.

500 km

 Hide Ans

Solution:
Option(C) is correct

Let’s say it was point $Z$ when $P$ asked the first question and point $Y$ when $P$ asked the second question.

It can be shown as:

$D$----$Z$---->----$M$-------->--------$Y$--------$A$

Let $DM = x$ km, $MA = y$ km

Therefore, distance is $DA = DM + MA = x + y$

As per the information given in the question:

$ZY = 300$ km

Also 

\(ZM=\dfrac{2x}{3}\text{ and }MY=\dfrac{2y}{3}\)

\(⇒ ZY = ZM + MY \)

\(=\dfrac{2x}{3}+\dfrac{2y}{3}\)

\(=300\)

$⇒ x+y=450$ km

So distance between D and A is 450 km


(0) Comment(s)