A train 200 m long passed a pole in 20 sec. How long will it take to pass a platform 610 m long?  Choose the correct choice from the following answers:
A) 46
B) 54
C) 92
D) 76
E) 81
Speed = 200/20= 
<gadget id="calculator">200/20</gadget>
<output>10</output>
10 m/sec.   Required time= (200 + 610)/10= 
<gadget id="calculator">(200 + 610)/10</gadget>
<output>81</output>
81 sec.   Answer: 81
<result>E</result>
A train 200 m long passed a pole in 20 sec. How long will it take to pass a platform 610 m long?