A train 200 metres long passes through a tunnel of 1.3 km. If speed of the train is 20 m/s then how long the train will take to come out of the tunnel completely?
A car needs to cover 800 km of distance. It covers first 500 km in 4 hours at constant speed. What should be the speed of this car to cover next 300 km so that the average speed of this car is 80 km/h.
On day 1, a car covers 300 km at 50 km/h. On day 2, same car travels at 60 km/h for 5 hours and on day 3, it covers 600 km in 9 hours at constant speed. What is the average speed of this car in these 3 days?
Car A and car B are moving towards each other from the distance of 3 km. Speed of car B is twice the speed of car A. What are the speeds of these two cars if cars are going to meet after 50 seconds.
A car travels 180 km at 90 km/h and then travels another 120 km at 40 km/h. What is the average speed of this car?