Q57
A train 100 meter long meets a man going in opposite direction at 5 km/h and passes him in 71/5 seconds. What is the speed of the train (in km/hr)?
A.
45 km/h
AnswerB.
60 km/h
C.
55 km/hr
D.
50 km/hr
Answer: Option A
Solution
Answer: Option A
Solution:
\begin{aligned}
& {\text{Relative speed of man & train}} \\
& {\text{ = }}\frac{{100 \times 5}}{{36}} \times \frac{{18}}{5} \\
& {\text{ = 50km/hr}} \\
& \therefore {\text{speed of train}} \\
& {\text{ = 50}} - {\text{5}} \\
& {\text{ = 45 km/hr}} \\\end{aligned}