Consider the following statements. Which of them are correct? (1) A train travelling at 180 km/hr took 5.4 seconds to cross a stationary man, so the length of the train is 250 m. (2) If a bus covers 172 km in 4 hours, its speed is 154.8 m/s. (3) If 25X + 25Y = 110, then the average of X and Y is 2.2.
1.A train at 180 km/hr crossing a man in 5.4 s has a length of 250 m
2.A bus covering 172 km in 4 hours has a speed of 154.8 m/s
3.If 25X + 25Y = 110, the average of X and Y is 2.2
A2 & 3 only
B1 & 2 only
C3 only ✓ Correct
D1 & 3 only
Correct answer: (C) 3 only
Explanation
Only Statement 3 is correct.
180 km/hr = 50 m/s, so length = 50 x 5.4 = 270 m, not 250 m.
172 km in 4 hr = 43 km/hr = 43/3.6 = 11.94 m/s, not 154.8 m/s.
25X + 25Y = 110 gives X + Y = 4.4.
Average = 4.4 / 2 = 2.2, so Statement 3 holds.
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