Question

A train 150m long, is running at 72 km/h. It crosses a bridge in 13 sec. find the length of bridge.

Answer 1

it's your answer thank you

Answer 2

We can solve using this equation:

$\large\boxed{\textsf{\textbf{\red{(length\:of \: bridge\: + \:length\: of \:train)\: =\: speed\: of\: train\: ×\: time\: to\: cross \:bridge\:}}}}$

so:

$x + 150 = 72 \: km \: h \times 13s$

Convert 72km/h to m/s → 72000m/3600s → 20m/s (speed of train)

Now solve :

x + 150m = 20m/s × 13s → x + 150m = 260m → x = 260m - 150m → x = 110m (length of bridge)