At noon an unloaded truck leaves Depot A for for Depot B 345 Miles away at a speed of 70mph 60 mins later a loaded truck leaves Depot B for Depot A at 55mph Both trucks maintain a constant speed using the same road At what time will the trucks pass each other
After 1 hour, the unloaded truck has travelled 70 miles so there are 345-70 = 275 miles between them when the loaded truck leaves depot B at 1 pm. They pass when their added distance = 275, i.e.
70t+55t = 275 (t is time after 1 pm)
t = 275/125 = 2.2 hours
The second truck will pass the first at the first VOSA weighbridge and laugh at the driver of the first truck being done for no speed limiter and driving over 56mph!!!