Abdul while driving to school, computer
the average speed to his trip to be
20km/h. On his return trip along
same route , there is less traffic and
the average speed is 30 km/h. What is
the average speed for Abdul's trip.
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Answer:
Let s be the distance covered during the trip.
Given, average speed for the trip = 20km h^-1
Average speed for return trip = 30 km h^-1
time taken for return trip = s/30
total time taken = s/30 + s/30
total distance covered for trip and return trip = s + s = 2s
therefore, avg speed = 2s/s/30+s/30 = 2s/s[30+20/20•30]
= 2•20•30/50 = 24 km h^-1
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