Determin the time interval that elapses between the arrival of two bikes traveling in a straight line at two different speeds.

Question

Consider two bikes, notably E and F, which start from the same point and travel along the same straight line from a start point P and reach an end point Q at a distance X from the start point. Bike E travels at a speed of 10.0 m/s and travels the distance of X (from point P to point Q) in 12.0 seconds. Bike F travels at a speed of 8.0 m/s and travels the same distance X (from point P to point Q). Determine the time interval the elapses between the arrival times of Bike E and F at the end point (point Q) of the straight line distance X from the start point (point P)

Answer 1

d = rt, so X = 10 m/s(120 s) = 120 m.

 

t = d/r, so bike F travels for 120 m/8 m/s = 15 s

 

The problem, with alllllll of that info, it doesn't tell us the bikes left at the same time, but it is inferred, so the answer is 15 s - 12 s = 3 seconds.