Time and Speed - Train and Boat

A truck driver must complete a 180 mile trip in 4 hours. If his average speed is 50 miles per hour for the first 3 hours, then how fast must he travel for the final hour?

A train can cross another train of equal length coming from the opposite direction with the speed of 108 km/h in 3 minutes. The speed of the other train is 90 km/h. Find the length of the train.

Two trains of equal length are running on parallel lines in the same direction at 46 km and 36 km per hour. The faster train passes the slower train in 36 seconds. The length of each train is-

There are 23 poles with a constant distance between each pole. A car takes 24 seconds to reach the 12^th pole. How much more time will it take to reach the last pole?

Pavel was cycling at 30 km/h and was passed by Ratan who was cycling at 40 km/h. If Ratan cycles for c minutes at his speed and then stops, how long, in minutes, will it take for Pavel to reach him?

A boy goes to school at a speed of 5 km/h and returns to the village at a speed of 4 km/h. If he takes 4 hours and 30 minutes in all, what is the distance between the village and the school? 

A motorcyclist completes a certain journey in 5 hours. He covers one-third distance at 60 km/hour and the rest 80 km/hour. The length of the journey is-

A boat goes 8 km in one hour along the stream and 2 km in one hour against the stream. The speed in km/hr of the stream is _____

Jeff takes 20 minutes to jog around the race course one time, and 25 minutes to jog around a second time. What is his average speed in miles per hour for the whole jog if the course is 3 miles long?

A man takes 3 hours 45 minutes to row a boat 22.5 km downstream of a river and 2 hours 30 minutes to cover a distance of 10 km upstream . Find the speed of the river current in km /hr.

A train travels 10 miles at a speed of 50 miles per hour. How fast must the train travel on the return trip if the round-trip travel time is to be 20 minutes?

The length of the train that takes 8 second to pass a pole when it runs at a speed of 36 km/hr is-

The distance between cities A and B is 120 miles. A car travels from A to B at 60 miles per hour and returns from B to A along the same route at 40 miles per hour. What is the average speed for the round trip?

If it is 250 miles from Dhaka to Dinajpur and 120 miles from Dhaka to Pabna, what percentage of the distance from Dhaka to Dinajpur is the distance from Dhaka to Pabna? 

A motorcycle covers 40km with a speed of 20km/hr. Find the speed of the motorcycle for the next 40km journey so that the average speed of the whole journey will be 30km/hr.

10 minutes after a plane leaves the airport, it is reported to be 40 miles away. What is the average speed in miles per hour of the plane?

If the distribution of movie durations is symmetric around the mean of 1.5 hours following a bell curve and if the standard deviation is 20 minutes, approximately what percentage of all movies are longer than 110 minutes?

A train 125m long passes a man, running at 5 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is-

Karim Traveled 60 miles from Dhaka to Gazipur at a certain speed. If his speed per hour were 2 miles faster, he would need 1 hour less to reach Gazipur. What was his initial speed?

A train 108 m long moving at a speed of 50 km/hr crosses a train 112 m long coming from opposite direction in 6 seconds. The speed of the second train is _____