SOLUTION: An aeroplane flies from A to B at a speed of 750km/h. On the return trip there was a strong tail wind and the airplane flew at 900km/h. The return flight took 20 min less than the

Question 1029020: An aeroplane flies from A to B at a speed of 750km/h. On the return trip there was a strong tail wind and the airplane flew at 900km/h. The return flight took 20 min less than the original. How many hours did the return trip take?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the time in hrs going from A to B
= the time in hrs on return trip
--------------------
Equation for A to B
(1)
Equation for B to A
(2)
-----------------------
By substitution:
(2)
(2)
(2)
(2)
and

and
min
The return time is 1 hr and 40 min
----------------
check:
(1)
(1)
(1) km
and
(2)
(2)
(2) km
OK
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