Ask a New Question

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
14 years ago

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
14 years ago

Related Questions

A car travalling 90km/h, applies breaks with a force of 8400N to act on the 1050kg car. a) what... A car traveling 90km/h is 100m behind a truck traveling 75km/h. How long will it take the car to r... A 66.7-kN car is travelling at 66.5 mph when the driver decides to exit the freeway by going up a ra... a truck travels at 90km/hr W for 10 min. then at 110 km/ hr for 38 km what was the trucks average ve... What time wen car driving 90km/h in the distance of 11 700km? A car whose speed is 90km/hr rounds a curve 180m in radius that is properly banked for a speed of 45... A plane flies 90km on a bearing 030 degree and then flies 150km due east. How far east of the starti... A plane flies 90KM on a bearing 040 and then flies 90KM due east how far is th... Lae is 90km on a bearing of 045° km Kerema and Goroka is 190 km on a bearing of 295° from Lae. Find... 90km/h in km only
Ask a New Question
Archives Contact Us Privacy Policy Terms of Use