A 600 metres long train is running at the speed of 81 km/hr. If it crosses a platform in 40 seconds, then what is the length of the platform (in metres)?
The average weight of 30 students in a class is 25 kgs. If the weight of the class teacher is added, the average weight increase by 2 kgs. The weight of the class teacher in kgs is
Rahul travels 8km towards east, turns right and travels another 6km, and then takes two successive left turns covering 21km and 6km in each turn respectively. Finally, he takes a right turn and travels 8km further. How far is he now from his original position?