Two trains are moving in opposite directions with the same speed. If the length of each train is 144 metres and they cross each other in 9 seconds, then what is the speed (in km/hr) of each train?
If each term in the given sequence is assigned number 1, 2, 3... according to their position from the left, then the sum of the numerical values of the positions of the symbols will be ____.
The expenses of a person increase by Rs. 50000 for every month in February and March. If his expenses in January was Rs. 50000, calculate his average expenditure (in Rs.) from January to March.