Asked by Jordan
travelling at 90km/hr except for a 30 minute rest stop. Average speed for the trip is 78km/hr.
what is the total travelling time and what is the total distance travelled??
thanks
what is the total travelling time and what is the total distance travelled??
thanks
Answers
Answered by
drwls
Let D = distance traveled (km)
T = total time of trip in hours
90 (T-0.5) = D
D = 78 T
Two equations, two unknowns.
Solve by substitutuion.
90(T - 0.5) = 78 T
12 T = 45
T = 3.75 hours (3.25 of which was driving)
D = 292.5 km
T = total time of trip in hours
90 (T-0.5) = D
D = 78 T
Two equations, two unknowns.
Solve by substitutuion.
90(T - 0.5) = 78 T
12 T = 45
T = 3.75 hours (3.25 of which was driving)
D = 292.5 km
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