Question

The speed of a train is 72km/hr. It crosses a pole in 14 sec. The train will cross a tunnel of length 400m in(sec)?

34
42
40
35​

Answer 1

Answer:

It will take 20 seconds to cross the tunnel.

Step-by-step explanation:

First, we'll convert the speed unit to m/s. For this, we need to multiply it by $\frac{5}{18}$

Speed = 72 × $\frac{5}{18}$ = 20m/s

Now, we must use the formula for acquiring speed and then find the time(t).

So,

$Speed = \frac{distance}{time}$

20 = $\frac{400}{t}$

20t = 400

t = $\frac{400}{20}$

t = 20s

Thus, it will take 20 seconds to cross the tunnel.  

I hope this helps!! If it does, please do mark it as the Brainliest!

Regards,

Lilac584

Answer 2

Answer:

34 seconds

Step-by-step explanation:

answers is 34