Answer:
see below
Explanation:
Let t = time (in hours)
a) i) First 105 km of journey
ii) Rest of journey
distance = 190 - 105 = 85 km
speed =
km/h
b) 3 hours 15 minutes = 3.25 hours
total time =
multiply by 4:
c)
(to 2 decimal places)
d) time ≥ 0, therefore, x = 53.68 only
Substitute x = 53.68 into the expression for
and solve for
: