he drove for 6 hours at 60 mph, or 360 miles
70% of 360 = 252
25% of 108 = 27
360-(252+27) = 81
since time = distance/speed,
252/65 + 27/54 + 81/x = 6
x = 10530/211 ≈ 49.9 mph
Emilio left Main Road at 8 A.M and arrived at Lame Lane at 2 P.M. His average for the whole journey was 60 mph. For the first 70% of the trip, he drove at an average speed of 65 mph. For the next 25% of the remaining trip, his average was 54 mph. Find his average speed for the remaining part of the trip.
Since it took him 6 hrs at 60 mph, I got 360 mi for how far it was and 70% of 360 is 252 and 25% is 90 which means the remaining part is 18. I don't know what to do with the 65 and 54.
1 answer