Rohan computes his average speed while driving to be 20km/hr. While returning through same route his average speed is 30km/hr. What is his average speed for whole trip?
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average speed driving to be = 20 km/hr
average speed of returning same route =30 km/hr
whole trip average speed = total speed / total time
= 30+20= 50 km
= 50 km/2 hrs
= 25 km/hr
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