5. A cyclist travels for 20 minutes at a speed of 30 km/h and for 40 minutes at 15 km/h. Find the total distance she travels and calculate her average speed.
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Answer:
Average speed = Total distance / Total Time
v = s/t
Let's calculate the total speed ..
Case 1
Time = 20 min = 1/3 of hour
Distance = speed × time
= 25 × 1/3
=8.3km
Case 2
Time = 40min = 2/3 of hour
Distance = speed × Time
= 40×2/3
We get 80/3 as our distance
Total Distance= 8.3+80/3 = 34.96
Total time = 1/3+2/3 = 3/3=1
Now, average speed
Average speed = total distance/total time
= 34.96/1
= 34.96
Explanation:
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