SOLUTION: A 810-mile, 7-hour plane trip was flown at two speeds. For the first part of the trip, the average speed was 111 mph. For the remainder of the trip, the average speed was 122 mph.

Question 1196999: A 810-mile, 7-hour plane trip was flown at two speeds. For the first part of the trip, the average speed was 111 mph. For the remainder of the trip, the average speed was 122 mph. How long (in hours) did the plane fly at each speed?

111 mph=____Hr.?
122 mph=____HR?
Found 2 solutions by ewatrrr, josgarithmetic:
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

Hi A 810-mile, 7-hour plane trip was flown at two speeds: 111mph & 122mph How long (in hours) did the plane fly at each speed? Let x represent speed at 122mph 111(7hr-x) + 122x = 810mi 11x = 810 - 7(111) 11x = 33mi x = 3hr, time flown at 122mph & 4hr at 111mph Checking our work: 366mi + 444mi = 810mi checks Wish You the Best in your Studies.

Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
A D mile, T hour plane trip was flown at two speeds. For the first part of the trip,
the average speed was L mph. For the remainder of the trip, the average speed was G mph.
How long (in hours) did the plane fly at each speed?

SPEEDS TIMES DISTANCES LOWER SPEED L T-x L(T-x) GREATER SPD. G x Gx TOTAL T D

Your example gives
D=810
L=111
G=122
T=7

Substitute and evaluate the unknown time, x.
Use it to evaluate T-x.
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