Two ships

Two ships sailed from Venice - a cargo speed of 10 knots and a ferry speed of 18 knots. At what time will the ferry catch up with the cargo ship if it sailed 10 hours later?

Correct result:

t =  12.5 h

Solution:

v1=10⋅ 1.852=18.52 km/h v2=18⋅ 1.852=33.336 km/h  s1=s2   v1⋅ (t+10)=v2⋅ t 18.52⋅ (t+10)=33.336⋅ t  14.816t=185.2  t=252=12.5=252=12.5 h

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