Consider the following statements:
(A) A train travelling 180 km/hr took 5.4 seconds to cross a stationary man. Length of the train is 250 m.
(B) If a bus covers 172 km in 4 hours, the speed of the bus is 154.8 m/s.
(C) If 25 X + 25 Y = 110, the average of X and Y is 2.2.
Which of the above statements is/are correct?निम्नलिखित कथनों पर विचार कीजिए:
(A) 180 किलोमीटर प्रति घंटे की रफ़्तार से चलने वाली रेलगाड़ी को किसी खड़े व्यक्ति को पार करने में 5.4 सेकण्ड लगा। रेलगाड़ी की लंबाई 250 मीटर है।
(B) यदि कोई बस 4 घंटे में 172 किलोमीटर जाती है तो बस की गति है 154.8 मीटर प्रति सेकण्ड।
(C) यदि 25 X + 25 Y = 110 है तो X और Y का औसत 2.2 है।
नीचे दिए गए विकल्पों में से सही उत्तर चुनिए:
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Correct answer: C. (C) onlyकेवल (C)
Explanation
(A) 180 km/hr = 180 × 5/18 = 50 m/s; in 5.4 s the train covers 50 × 5.4 = 270 m, not 250 m — incorrect. (B) 172 km in 4 hours = 43 km/hr = 43 × 5/18 ≈ 11.94 m/s; 154.8 is the figure in km/hr units mistakenly labelled m/s — incorrect. (C) 25(X + Y) = 110 → X + Y = 4.4 → average = 4.4 ÷ 2 = 2.2 — correct. Hence (C) only.(A) 180 किमी/घंटा = 180 × 5/18 = 50 मी/से; 5.4 सेकंड में रेलगाड़ी 50 × 5.4 = 270 मीटर चलेगी, 250 मीटर नहीं — असत्य। (B) 4 घंटे में 172 किमी = 43 किमी/घंटा = 43 × 5/18 ≈ 11.94 मी/से; 154.8 वास्तव में किमी/घंटा की गणना है जिसे भूलवश मी/से लिख दिया गया — असत्य। (C) 25(X + Y) = 110 → X + Y = 4.4 → औसत = 4.4 ÷ 2 = 2.2 — सत्य। अतः केवल (C)।More Mathematical Reasoning and Aptitude questions
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