Your decimal answers are right, but 4.42 hr isn't 4 hr 42 min; it's 4hr + .42hr = 4 hr + .42(60min) = 4hr + 25.2min.
Looking to see if I have the right answer...
An airplane travels 2100 km at a speed of 800 km/h, and then encounters a tailwind that boosts its speed to 1000 km/h for the next 1800 km. What was the total time for the trip? What was the average speed of the plane for this trip?
Total Time?
(2100 km)/ (800 km/h) = 2.62
(1800 km)/ (1000 km/h) = 1.8
2.62+1.8= 4.42 (4 hours 42 Minutes)
What was the average speed?
AS = (Total Distance)/(Elapsed time)
AS = (2100+1800)/ (4.42)
AS = (3900)/(4.42)
Average Speed = 882.35
I appreciate the help,
qbkr21