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A car travels along a 60 km road. It travels the first 30 km with a speed of 60 km/h. Whit
what speed should it travel the next 30km so as to average 40km/h? (3).
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Answer:
60km/h
Explanation:
v1 = 30 km/h
total distance of track = 60km
speed= distance / time
30=30/t
average velocity= total distance covered / total time taken
average velocity= 2v1*v2/ v1+v2
40 = 2 * 30v2/ 30+ v2
40(30+v2)= 60*v2
1200+400v2= 60v2
1200= 20v2
v2= 60 km/h
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