V=34mi/h * 1609m/mi * 1h/3600s.=15.2 m/s.
d = V*t = 80 m.
15.2t = 80.
t = 5.3 s.
The stoplights on a street are designed to keep traffic moving at 34 mi/h. The average length of a street block between traffic lights is about 80 m.
What must be the time delay between green lights on successive blocks to keep the traffic moving continuously? There are 1.609× 103
m in a mile.
Answer in units of s.
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