a train 450 metres long is moving at a speed of 25 kmph. it will cross a man coming from the opposite direction at a speed of 2 km per hour in:  Choose the correct choice from the following
A) 30 sec B) 32 sec C) 36 sec D) 38 sec E) 60 sec
<gadget id="calculator">450 / 1_000</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">25 + 2</gadget>
<output>27</output>

<gadget id="calculator">(9/20) / 27</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">3_600 * (1/60)</gadget>
<output>60</output>

<result>E</result>
a train 450 metres long is moving at a speed of 25 kmph. it will cross a man coming from the opposite direction at a speed of 2 km per hour in:
multiply(const_3600, divide(divide(450, const_1000), add(25, 2)))
"relative speed = ( 25 + 2 ) km / hr = 27 km / hr = ( 27 × 5 / 18 ) m / sec = 15 / 2 m / sec . time taken by the train to pass the man = ( 450 × 2 / 15 ) sec = 60 sec answer : e"