Answer: 1 & 9/20 Hours
Step-by-step explanation: Lets start by turning fraction into mintues. 7/10h is 42m, and 3/4h is 45m. Now we add 42+45. Which equals 87.
87m is an 1 hour and 27 min or 1 & 27/60 lets simplify 27/60. Which is 9/20. So we end up with 1 & 9/20 hours