175
explaination: simple math
Ok so we do
-11/4 + 2/1
find like denominator
-11/4 + 8/4
=
-3/4
So thats your final answer :)
B) 2.5 hours , because 8 mph is 1 hour and the another 8mph is 1 hour 8+8mph =16mph 1+1hr=2hr half of 8 is 4mph is .5hr so therefore 8+8+4=20mph 1+1+ 30mins= 2.5hr
