Question 955284
1680 miles/3hours=560 mph The combined speed of the two planes is 560 mph.
r=speed of slower plane; r+60mph=speed of faster plane
r+r+60mph=560mph
2r=500mph
r-250mph ANSWER 1: The speed of the slower plane is 250mph.
r+60mph=250mph+60mph=310mph ANSWER 2: The speed of the faster plane is 310 mph.