SOLUTION: A speedboat travels at 60km/hr for two hours and then at 90km/hr for one hour. Find its average speed over the three hours

Question 986973: A speedboat travels at 60km/hr for two hours and then at 90km/hr for one hour. Find its average speed over the three hours
Found 2 solutions by ankor@dixie-net.com, ikleyn:
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
A speedboat travels at 60km/hr for two hours and then at 90km/hr for one hour. Find its average speed over the three hours:
:
we need to know how far, in how may hours. S = dist/time
Find the dist
2*60 = 120 km
1*90 = 90
--------------
total 210 km
:
S =
S = 70 km/h over 3 hrs
Answer by ikleyn(52803) (Show Source): You can put this solution on YOUR website!
.
The total distance is 2*60 + 90 = 210 km.

The spent time is 3 hours.

The average speed is the total distance divided by the time spent, i.e.

= 70 .

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