bob drove 120 miles on his vacation .he drove an average of 1.2 times faster on the second 60 miles of his tripe than he did on the first 60 miles of his trip.which expression represents the time he spent driving ?let x= his speed in the first half of the trip.
Mathematics · High School · Tue Nov 03 2020
llm
Answered on
Let Bob's speed be x in first half
Then speed of bob in second half is 1.2x
Distance = 60 miles in each half.
Formula :
Time = distance/speed
t = 60/x + 60/1.2x
t = 60/x + 50/x
t = (60 + 50)/x
t = 110/x