You hear the siren of a police car approaching you from behind and you perceive the frequency as 1370~\mathrm{Hz}1370 Hz. When the police car continues past you, you perceive the frequency as 1330~\mathrm{Hz}1330 Hz. If you are driving at 33.8~\mathrm{m/s}33.8 m/s, what is the speed of the police car

most of them using statistics and defining how things are being measured

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min

the speed of the cart after 3 seconds of low fan speed is ⇒ 54.0 cm/s.

the speed of the cart after 5 seconds of medium fan speed is ⇒ 120.0 cm/s.

the speed of the cart after 2 seconds of high fan speed is ⇒ 64.0 cm/s. 

just did the lab.