Question

calculate the average speed of a car while it travels 20 km at 40 km per hour and 90 km at 60 km per hour​

Answer 1

Answer:

Distance 1= 20 km

Speed 1= 40 km/h

Distance 2= 90 km

Speed 2= 60 km/h

Average speed= Total distance/total time

Total distance= distance 1 + distance 2

= 20 km + 90 km

= 110 km

We calculate total speed first in order to find total time.

Total speed= 40 km/h + 60 km/h

= 100 km/h

Speed= distance/time

Time= Total distance / Total speed

= 110 km / 100 km/h

= 1.1 h

Thus, total time= 1.1 h

Average speed= 110 km / 1.1 h

= 100 km/h

Thus, average speed is 100 km/h.

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