1:47- use the train tracks. Start with 62 m on top and 1 s on bottom. There are 1000 m in a km and 0.621 mi in a km. Then, convert seconds to minutes and then to hours.
1:49- use train tracks again. a) start with the speed of light 3.00e8 m/s with 3.00e8 m on top and 1 sec on bottom. Then, covert meters to km and then to miles like in 47. Then convert seconds to minutes to hours to days to years. NOW you should have a number with units miles/year. Multiply this by 1.4 years to get miles
1:49- use train tracks again. a) start with the speed of light 3.00e8 m/s with 3.00e8 m on top and 1 sec on bottom. Then, covert meters to km and then to miles like in 47. Then convert seconds to minutes to hours to days to years. NOW you should have a number with units miles/year. Multiply this by 1.4 years to get miles