Find the area of the square field if a train 800 metres long passes the field with a speed of 120 kmph in one minute.	Choose the correct option:
A) 1.44 sq. km
B) 4 sq. km
C) 2 sq. km
D) 2.64 sq. km
E) None of these
Explanation:   120 km/hr = 120 * 5/18 = 33.33 m/s   v = d/t ; 33.33 = d/60   d = 2000 m   Hence, in one minute the train travels 2000 m. But, as the train is 800 m long and it passes the field, the length of the field is 2000 – 800 = 1200 m.   Area = 1200 * 1200 = 1.44 sq. km   1.44 sq. kmNSWER: 1.44 sq. km
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Find the area of the square field if a train 800 metres long passes the field with a speed of 120 kmph in one minute.