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41. The ratio between the speeds of two trains is 7:8. If the second train runs 400 kilometers in 4 hours, then the speed of the first train is?

42. A truck covers a distance of 550 meters in 1 minutes whereas a bus covers a distance of 33 kilometers in 45 minutes. The ratio of their speeds is?

43. one of the two buses completes a journey of 300 km in 7 1/2 hours and the other a journey of 450 km in 9 hours. the ratio of their average speeds is?

44. A car is running at a speed of 108 km. What distance will it cover in 15 seconds?

45. How long will a boy take to run round a square field of side 35 meters, if he runs at the rate of 9 km/hr?