What is the answer for 3,4,5,6 ?

If a boat travels 3 miles in 1.5 hours how far will it travel in 2 hours?

The sum of the reciprocal of a positive number and the reciprocal of 2 more than the number is 3/4 equation: the number is

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?