A 260 metre long train crosses a 120 metre long wall in 19 seconds. What is the speed of the train?(in km/hr) एक 260 मीटर लम्बी रेलगाड़ी 120 मीटर लम्बी दीवार को 19 सेकेण्ड में पार करती है, तो रेलगाड़ी की चाल क्या है?(किमी/घंटे में)
D
Correct answer
Explanation
Total distance to cross = length of train + length of wall = 260 + 120 = 380 meters. Time taken = 19 seconds. Speed = distance/time = 380/19 = 20 m/s. Convert to km/hr: 20 × (3600/1000) = 20 × 3.6 = 72 km/hr. Option A (27) is incorrectly calculated. Option B (49) might result from using only train length. Option C (70) is close but incorrect. Remember to add both lengths when crossing a platform, bridge, or wall.