Question

A train whose length is 200 m, is running at a speed of 72 km/h. How long will it take to cross a railway signal?

• A. 5 s
• B. 10 s
• C. 15 s
• D. 20 s

Answer 1

The correct option is B

10 s

Given, the speed of train = 72 km/h

Now, 90 km/h = 72 $\times$ $\frac{5}{18}$ m/s
$(\because 1km/h=\frac{5}{18}m/s)$

= 4 $\times$ 5 m/s

= 20 m/s

Distance to be covered = length of train = 200 m (given)

$\because$ $Time=\frac{Distance}{Speed}$

$\Rightarrow$ Time taken = $\frac{200}{20}$ s

= 10 s