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Dear student,
Let x be the total distance.
time taken t1 for 1st part=x/2*30=x/60
t2=x/40
total time taken=x/60+x/40= 2x+3x/120=5x/120
total distance=x
average velocity=x*120/5x=24 km/hr
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Sagar Singh
B.Tech, IIT Delhi
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