Two towns

X and Y are two towns . A man goes from town X to town Y at an average speed of 30km/h and returns at the average speed 20km/h. Find the distance between the two towns if the man takes 10 hours on the whole.

Correct answer:

s =  120 km

Step-by-step explanation:

v1=30 km/h v2=20 km/h t=10 h  t1 = s/v1 t2 = s/v2 t1+t2 = t  s/v1+s/v2=t s/30+s/20=10  5s=600  s=5600=120=120 km  s=120   Verifying Solution:   t1=s/v1=120/30=4 h t2=s/v2=120/20=6 h



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