a train of 40 carriages, each of 60 meters length, when an engine also of 60 meters length is running at a speed of 60 kmph. in what time will the train cross a bridge 1.5 km long?  Choose the correct answer:
A) 6	B) 3	C) 4	D) 3.9	E) 3.6
<gadget id="calculator">40 + 1</gadget>
<output>41</output>

<gadget id="calculator">41 * 60</gadget>
<output>2_460</output>

<gadget id="calculator">2_460 / 1_000</gadget>
<output>123/50 = around 2.46</output>

<gadget id="calculator">(123/50) + 1.5</gadget>
<output>3.96</output>

<result>D</result>
a train of 40 carriages, each of 60 meters length, when an engine also of 60 meters length is running at a speed of 60 kmph. in what time will the train cross a bridge 1.5 km long?
add(divide(multiply(add(40, const_1), 60), const_1000), 1.5)
d = 40 * 60 + 1500 = 3900 m t = 3900 / 60 * 18 / 5 = 234 sec = 3.9 mins answer : d