John travels a certain distance in 1 hour 24 minutes by covering two-third of the distance at 4 km/h and the rest at 5 km/h. Calculate the total distance.
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Answer:
total time= 1hr 24min=8/5hr
total speed = 4+5=9km/hr
Now
s=d/t
d=s×t
9×8/5=72/5km
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