The average journey time of test vehicle travelling with the stream is 6.5 min. The average journey time during trips against the stream is 8.5 min. The number of vehicles encountered in the stream while the test vehicle was moving against the traffic stream is 206, number of vehicles that had overtaken the test vehicle is 74 and the number of vehicles overtaken by the test vehicle is 10. Find the flow of the stream.
- A15 veh/min
- B16 veh/min
- C17 veh/min
- D18 veh/minCorrect
Solution
Concept
Flow
Formula
q = (x + y)/(ta + tw)
Step-by-step solution
1. x + y = 206 + 74 − 10 = 270. 2. q = 270/(8.5 + 6.5) = 18 veh/min.
Explanation
Moving observer formula.
Why the other options are wrong
Others do not follow.
Correct answer: D) 18 veh/min