1.

a plane flies a distance 1/4 th of the total distance with speed v and remaining distance with speed v1 if the average speed of the plane over the journey is 5v/4 then v1​

Answer»

tion:LET Total DISTANCE= DTIME TAKEN for 1/4th distance= D/4/v =t1time taken for remaining distance = 3D/4/v1=t2average SPEED = D/(t1+t2)=5v/45v/4= D/(D/4v+3D/4v1)= 1/(1/4v+3/4v1)(1/4v+3/4v1)* 5v=45/4+15v/(4v1) = 45+15v/v1=16v/v1= 11/15v1= 15/11v



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