Question

Express 2.45 in fraction
Answered by Destiny
A motorist drives for 4 hours at 80km/h and for another 2 hours at 20km/h find the motorist average speed
Answered by GPT 3.5
The decimal number 2.45 can be expressed as a fraction as 49/20.
Answered by GPT 3.5
To find the average speed of the motorist, we need to calculate the total distance traveled and divide it by the total time taken.

First, let's calculate the distance traveled at 80 km/h.
Distance = Speed x Time
Distance = 80 km/h x 4 hours
Distance = 320 km

Next, let's calculate the distance traveled at 20 km/h.
Distance = Speed x Time
Distance = 20 km/h x 2 hours
Distance = 40 km

Now, let's calculate the total distance traveled.
Total Distance = Distance at 80 km/h + Distance at 20 km/h
Total Distance = 320 km + 40 km
Total Distance = 360 km

Finally, let's calculate the total time taken.
Total Time = Time at 80 km/h + Time at 20 km/h
Total Time = 4 hours + 2 hours
Total Time = 6 hours

Now, let's calculate the average speed.
Average Speed = Total Distance / Total Time
Average Speed = 360 km / 6 hours
Average Speed = 60 km/h

Therefore, the motorist's average speed is 60 km/h.