Question
A man in a train notices that he can count 21 telephone posts in one minute. If they are known to be 50 metres apart, at what speed is the train travelling?
A man in a train notices that he can count 21 telephone posts in one minute. If they are known to be 50 metres apart, at what speed is the train travelling?
Answer: Option D
Was this answer helpful ?
Answer : Option D
Explanation :
The man in the train notices that he can count 21 telephone posts in one minute.
Number of gaps between 21 posts are 20 and Two posts are 50 metres apart.
It means 20 x 50 meters are covered in 1 minute.
$MF#%\begin{align}
&\text{Distance = }20 \times 50\text{ meter = }\dfrac{20 \times 50}{1000}\text{ km = 1 km}\\\\
&\text{Time = 1 minute = }\dfrac{1}{60}\text{hour}\\\\
&\text{Speed = }\dfrac{\text{Distance}}{\text{Time}} = \dfrac{1}{(\dfrac{1}{60})} = 60\text{ km/hr}
\end{align} $MF#%
Was this answer helpful ?
More Questions on This Topic :
Question 3.
In covering a distance of 30 km, Amla takes ....
Question 9.
Two guns were fired from the same place
at....
Question 10.
Two trains start from P and Q respectively a....
Latest Videos
Latest Test Papers
Submit Solution