Steamship

Between the two ports on the river is going steamship. The journey there and back takes 8:42. Downstream steamship traveling at 20 km/h, upstream 9 km/h.

What is the distance between the ports?

Correct result:

x =  54 km

Solution:

 x=s1=s2 s1=v1t1 s2=v2t2 t1+t2=8.7h v1t1=v2(8.7t1) t1=v28.7v1+v2=2.7 h t2=8.7t1=6 h  x=v1t1=20920+98.7=54 km



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