Question 254460: A car travels 60km at 30km/h and then a further 180km @ 16- km/h. Find:
a) Total time taken.
b) The average Speed for whole Journey. Found 2 solutions by nerdybill, richwmiller:Answer by nerdybill(7384) (Show Source):
You can put this solution on YOUR website! A car travels 60km at 30km/h and then a further 180km @ 16- km/h. Find:
a) Total time taken.
b) The average Speed for whole Journey.
.
Applying the "distance formula": d = rt
where
d is distance
r is rate or speed
t is time
.
For the car traveling 60km at 30km/h:
time:
d = rt
d/r = t
60/30 = t
2 hrs = t
distance:
60 km
.
Traveling 180km @ 16- km/h:
time:
d = rt
d/r = t
180/16 = t
11.25 hrs = t
distance:
180 km
.
a) Total time taken:
2 + 11.25 = 13.25 hours
b) The average Speed for whole Journey.
Total distance: 60+180=240 km
Average speed:
240/13.25
= 18.11 km/h
You can put this solution on YOUR website! rt=d
30*x=60
x=2
16*y=180
y=180/16
y=90/8
y=45/4
y=11.5
x+y=13.5 hours total time
Are you sure you have the right numbers?
Don't try to be fancy and lazy with symbols such as @
180+60=240 km
average speed d/t=240/13.5=480/27=160/9=17 7/9 kmh
