a) 3501
b) 3600
c) 3800
d) None of these
Answer: a
Explanation: Distance covered by the train in 5 hours = (42 × 5) km
= 210 km
= 210000 m
Number of pillars counted by the man
= $$\left( {\frac{{210000}}{{60}} + 1} \right)$$
= 3500 + 1
= 3501
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