Question 1055146
Let D represent the distance plane travels due east
D = rt  0r t = D/r
|Question States:
D/100kph + D/150kph = 4hr
3D + 2D = 1200
5D = 1200
D = 240km, distance plane travels due east
Checking:
240k/100kph + 240k/150kph = 2.4hr + 1.6hr = 4hr CHECKS!