Time and Distance - Quantitative Aptitude (MCQ) questions for Q. 726

Q.   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.
- Published on 06 Jul 15

a. 1.44 sq. km
b. 4 sq. km
c. 2 sq. km
d. 2.64 sq. km

ANSWER: 1.44 sq. km
 
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

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