A train 100 meters long completely passes a man walking in the same direction at 6km/h in 5 second and a car in the same direction in 6 seconds. The speed of car is:
Q1. A train 100 meters long completely passes a man walking in the same direction at 6km/h in 5 second and a car in the same direction in 6 seconds. The speed of car is:
Answer: 18km/h
Explanation: Train's absolute speed = 20 m/s + 6 km/h = 21.67 m/s = 78 km/h; relative to the car the train covers 100 m in 6 s (16.67 m/s = 60 km/h), so car speed = 78 − 60 = 18 km/h.