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A train 100 m long is running at the speed of 30 km / hr. find the time taken by it to pass a man standing near the railway line.

Two trains 100 meters and 120 meters long are running in the same direction with speeds of 72 km/hr; in how much time will the first train cross the second

Speed of a boat in standing water is 9 kmph and the speed of the stream is 1. 5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is

If a man reduces the selling price of a fan from Rs.400 to Rs.380, his loss increases by 2. The cost price of the fan is

The average age of a class of 39 students is 15 years. If the age of the teacher be included, then the average increases by3 months. Find the age of the teacher.