A train covers a distance of 12 km in 10 minutes. If it takes 6 seconds to pass a telegraph post, then the length of the train is
Choose the correct choice from the following answers:
A) 100m
B) 120m
C) 140m
D) 160m
E) 170cm
Explanation:   Speed =12/10x 60 km/hr = 72 x5/18m/sec = 20 m/sec.   Length of the train = (Speed x Time) = (20 x 6) m = 120 m   Answer: Option 120m
<result>B</result>
A train covers a distance of 12 km in 10 minutes. If it takes 6 seconds to pass a telegraph post, then the length of the train is