The problem:
A jet flew from Tokyo to Bangkok, a distance of 4800km. On the return trip, the speed was decreased by 200 km/h. If the difference in the times of the flights was 2 hours, what was the jet's speed from Bangkok to Tokyo?
From the problem, we can see that the variables are:
Distance:
T to B = 4800km
B to T = 4800km
Speed:
T to B = $x$km/h
B to T = $x-200$km/h
Time:
T to B = $x$h
B to T = $x-2$h
The problem definitely needs to be solved using the distance formula, $d=s*t$. Rearranging it for time, we get $t=d/s$
What do I do from here? I know from solving similar previous problems that I have to factor it and get the x-intercepts (one of them will be the jet's speed) but how to I solve up to that point when there are two unknowns?
Thank you!