Question 479080
Mountain distance =888 miles-- speed = x 
time (mountain)= 888/x


ocean distance = 280 miles - let speed be x-4
time (ocean)= 280/(x-4)


Time ( mountain)= 3*time(ocean)

888/x= 3(280/(x-4)
cross multiply
888(x-4)=3*280*x
888x-3552=840x
48x=3552
x=3552/48
x= 74 mph => mountain speed

Ocean speed => 70-4=70 mph

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