Two tankers contain 550 litres and 310 litres of petrol respectively. A container with maximum capacity is used which can measure the petrol of either tanker in exact number of litres. How many containers of petrol are there in the first tanker.
Trains A and B leave station at the same time. Train A travels in West direction and train B travels in North direction. Train A is 0.5 km/hour slower than train B. After 2 hours, trains are 29 km apart. Find the speed of both trains.