A car travels 30 km at a uniform speed of 40 km/h and the next 20 km at a uniform speed of 20 Km/h. fund the average speed...
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Answer:
28.57 km/hr
Explanation:
Total distance= 50
time = d / s
for t1, d = 30 and s = 40
hence t1 = 30/40 hours or 3/4 hours
similarly, t2 = 20/20 hours or 1 hour
total time is therefore 3/4+1 or 7/4 hours
therefore, average speed = total distance / total time
= 50/7/4
= 28.57 km/h
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