a motorist travels at 80 km/hr for 3 hours and 2 more hours at 100 km/hr. what is the average speed for the whole trip?
figure the distance on each leg, then add.
average speed=totaldistance/totaltime
To find the average speed for the whole trip, you need to calculate the total distance traveled and divide it by the total time taken.
First, let's calculate the distance traveled in the first part of the trip, where the motorist traveled at 80 km/hr for 3 hours.
Distance = Speed x Time
Distance (Part 1) = 80 km/hr x 3 hrs = 240 km
Next, let's calculate the distance traveled in the second part of the trip, where the motorist traveled at 100 km/hr for 2 hours.
Distance (Part 2) = 100 km/hr x 2 hrs = 200 km
Now, let's calculate the total distance traveled for the whole trip.
Total Distance = Distance (Part 1) + Distance (Part 2)
Total Distance = 240 km + 200 km = 440 km
To find the average speed, we need to divide the total distance by the total time taken, which is 5 hours.
Average Speed = Total Distance / Total Time
Average Speed = 440 km / 5 hrs = 88 km/hr
Therefore, the average speed for the whole trip is 88 km/hr.