A mam walks 6.km at 12 km/h and returns at 10 km/h find his average speed
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Answer:
10 kmph (approx)
Step-by-step explanation:
speed 1= 12km/h
speed 2= 10km/h
time 1= distance 1/ speed 1
time 1= 6/12
time 1= 0.5 hour
since d1= d2
time 2= distance 1/speed 2
time 2= 6/10
t2= 0.6 hour
average speed= total distance/ total time
avg speed=6+6 / 0.5+0.6
avg speed= 12/1.1
=>120/11
=> 10.09 km/h
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