# A jet flew from Tokyo to Bangkok, a distance of 4800 km. On the return trip the speed was decreased by 200km/h. If the difference in the times of the flights was 2h, what was the speed from Bangkok to Tokyo?

Mar 7, 2016

600 km/h

#### Explanation:

V km/h = velocity for the return flight
T h = Time for return flight
VT = 4800
$\left(V + 200\right) \left(T - 2\right) = 4800$
Eliminating T,
${V}^{2} + 200 V - 480000 = 0$
Positive solution is V = 600 km/h