A truck move with speed of 90 km/hr for 20 min and at 60km/hr for next 20 min.
Find the average speed of the truck
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Average Speed = Total Distance/ Total Time
Speed in case 1 = 90km/hr = 90/60 km/min
Speed in case 2 = 60km/hr = 60/60 km/min = 1 km/min
Distance travelled in first case = Speed × Time
=90/60 × 20 = 90/3 = 30 km
Distance travelled in second case = Speed × Time
=1 × 20 = 20km
Therefore, total distance travelled= 30+20 = 50km
total time taken = 40 min
Hence average speed = 50/40 = 5/4 km/min
= 5/4 × 60 = 75km/hr
Hope this is helpful to you
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