Question 1197978
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At the time when the passenger train has caught up with the freight train, the distances the two trains have traveled are the same.<br>
At that time, the passenger train has been traveling for 4 hours and the freight train has been traveling for 6 hours.<br>
The distances are the same, and the ratio of times is 6:4 = 3:2; that means the ratio of speeds is 2:3.  So the speed of the freight train is 2/3 the speed of the passenger train.<br>
ANSWER: 16*(2/3) = 32/3 km/hr<br>