help needed Physics O/N/2004 P1 Q 18,,,,,,

[ArsalanT]

O/N/2004 P1 Q 18,,,,,,
A cyclist is capable of generating an average power of 3kW during a 4km speed trial. His aerodynamic suit and position on the cycle reduce resistive forces to 180N.
What is the approximate time achieved in the speed trial?

A. 140s B. 240s C. 1300s D. 2200s

Sumeone plz explain this!!

 

[Xenon]

we know P = F x V
which can be written as P = (F x d)/ t
putting the given data

3 x 1000 = (180 x 4 x 1000)/ t
which gives t = (180 x 4 x 1000)/(3000 ) = 240 s

 

[ArsalanT]

Thanx Man!!