Answer:
47.91 sec
Explanation:
it is given that 
at t=0 velocity =0 ( as it is given that it is starting from rest )
we have to find time at which velocity will be 3.3 
we know that 

integrating both side
---------------eqn 1
at t=o it is given that v=0 putting these value in eqn 1 c=0
so 
when v= 3.3 
t=
=47.91 sec
I believe it’s c because you don’t want your gas to run real low, so I think it’s best to do it when your fuel.
Answer:
Detailed solution is given in attached image
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