(Solved): A double-tube detector installed on a one-lane road detected four vehicles within one minute ( \( t ...

A double-tube detector installed on a one-lane road detected four vehicles within one minute ( \( t=0 \) to 60 seconds): a. What is the volume in \( \frac{v e h}{h r} \) ? b. What is the time-mean speed to the nearest integer in mph? c. What is the space-mean speed to the nearest integer in mph? d. What is the average headway in seconds?