Calculate the velocity of sound in air in m/s when a man standing 99m from the foot of 9 tall cliff , claps his hands and hears and echo 0.6s later.

with 5 seconds, no, but over time if the police car stays at 65m/s ad the speeding car stays at 60, then obviously yes, but the answer to your question would be, no.

hope this : )

v=ir = 3x15 =45 v

if they have a finite resultant