Civil Services Examination · प्रश्न 41
An explosion takes place at a certain distance from an army camp. As soon as the sensor in the camp receives the sound of the explosion, a drone starts flying towards the spot of explosion. The drone clicks a picture from the spot and the camp receives it at the same time. Immediately another drone starts flying to the spot and it also sends a picture as soon as it reaches the spot. The two pictures were received at 5:02 PM and 5:05 PM, respectively. If the speed of the drones is 30 m/s, at what time did the explosion take place? Assume that the speed of sound is 300 m/s.
उत्तर देखें और व्याख्या
उत्तर: (C) 4:58:42 PM
व्याख्या
The second drone flies 3 minutes: distance = 180 × 30 = 5400 m. The first drone also took 180 s, so it started at 4:59:00. Sound took 5400/300 = 18 s, so the explosion was at 4:58:42 PM.