the length of the bridge, which a train 130 metres long and travelling at 36 km / hr can cross in 45 seconds, is:  Choose the correct choice from the following answers:
A) 320 m
B) 225 m
C) 245 m
D) 250 m
E) 240 m
<gadget id="calculator">1_000 / 1</gadget>
<output>1_000</output>

<gadget id="calculator">36 * 1_000</gadget>
<output>36_000</output>

<gadget id="calculator">3_600 / 1</gadget>
<output>3_600</output>

<gadget id="calculator">36_000 / 3_600</gadget>
<output>10</output>

<gadget id="calculator">10 * 45</gadget>
<output>450</output>

<gadget id="calculator">450 - 130</gadget>
<output>320</output>

<result>A</result>
the length of the bridge, which a train 130 metres long and travelling at 36 km / hr can cross in 45 seconds, is:
subtract(multiply(divide(multiply(36, speed(const_1000, const_1)), speed(const_3600, const_1)), 45), 130)
"speed = [ 36 x 5 / 18 ] m / sec = 10 m / sec time = 45 sec let the length of bridge be x metres . then , ( 130 + x ) / 45 = 10 = > 130 + x = 450 = > x = 320 m . answer : a"