Question

(b) The train is 61 cm long and travels at a speed of 18 cm/s.

Answer 1

Answer:

The length of the bridge is 72 cm

Step-by-step explanation:

In order to find the length of bridge, we have to apply distance formula which is D = S × T where S represents speed and T is time :

$d = s \times t$

$let \: s = 18,t = 4$

$d = 18 \times 4$

$d = 72 \: cm$

Answer 2

Answer:

It goes 18 cm every second:

18 x 4 = 72 cm

The bridge is 72 cm long.

Hope this helps!