Final answer:
a) The time Remy spent walking home is m/3 hours. b) The total time Remy spent walking is 7m/12 hours.
Step-by-step explanation:
a) Time Remy spent walking home:
To find the time Remy spent walking home, we can use the formula: Time = Distance / Speed. The distance from Remy's friend's house to home is m miles. The speed Remy walked home is 3 mph.
Therefore, the time Remy spent walking home is m/3 hours.
b) Time Remy spent walking:
The total distance Remy walked is twice the distance between the houses, which is 2m miles. The average speed Remy walked is the total distance divided by the total time spent walking. The time Remy spent walking is the sum of the time walking to the friend's house and the time walking back home.
The time Remy spent walking is m/4 hours to the friend's house and m/3 hours back home. Therefore, the total time Remy spent walking is (m/4) + (m/3) = (3m + 4m)/12 = 7m/12 hours.