The owner of a bike buys petrol for 3 years continuously at Rs 64, Rs 80 and Rs 320 per litre respectively. If he spends Rs 32,000 every year buying petrol, what is the average price per litre of petrol?

A shopkeeper buys three products a, b, c and sells them at 20%, 30%, 40% profit, respectively. What is ratio of the selling price of these products, if the ratio of their cost prices is 4:3 :2?

Find the area of triangle whose medians are 8 cm, 15 cm and 17 cm respectively?

A man can row $$7{1\over 2}km/h$$ in still water. If a river running at 1.5 km an hour, it takes him 50 minutes to row to a place and back, how far off is the place? 

What will be come in place of question mark(?) in the following number series?
3, 22, ? , 673, 2696, 8093

Two numbers are in the ratio 3 : 4. Their LCM is 84 . The greater number is: 

Find the area of a white sheet required to prepare a cone with a height of 21cm and the radius of 20cm.

Running at a speed of 60 km per hour, a train passed through a 1.5 km long tunnel in two minutes, what is the length of the train?