He now has 44 so subtract 17 from that and you get 27 (1/2 of the number of his original stamp collection). Then add 27 +27 and you get 54. I believe 54 is the answer. Hope that helps!
Time = distance/speed So all you have to do is plug the numbers in and you get the answer Time = 1,250 kilometres/150 kilometres per hour Time = 8.333 hours
