Speed, Distance and Time

X and Y are two stations which are 320 miles apart. A train starts at 7:00 am from X and travels towards Y at 70 mph. After 2 hours, another train starts from Y and travels towards X at 20 mph. At what time do they meet?

A train leaves from a station and moves at a certain speed. After 2 hours, another train leaves from the same station and moves in the same direction at a speed of 60 mph. If it catches up with the first train in 4 hours, what is the speed of the first train?

A man travels at 3 kmh in still water. If the water current’s velocity is 1 kmh, it takes 3 hours to row to a place and come back. How far is the place if the man? (hint: He will be travelling at 2 different speeds, 1 going against the current and 2 going with the current; because he has to travel in both directions to go there and back.)

With the wind, an airplane covers a distance of 2400 km in 4 hours. Against the wind, the plane travels the same distance in 6 hours. What is the speed of the plane?

With the wind, an airplane covers a distance of 2400 km in 4 hours. Against the wind, the plane travels the same distance in 6 hours. What is the speed of the wind?