Question 1114002
Between Brisbane and Toowoomba workers are repairing a section of road 7.5
 kilometres in length.
 The speed limit on this section of the road is usually 100 km/h.
 Due to the roadwork, the speed has been reduced to 60 km/h.
 How many minutes will the roadwork add to the journey?
:
time = dist/speed
:
Find how long it takes to go 7.5 km at 100 km/h
t = {{{7.5/100}}} = .075 hrs, which is 60*.075 = 4.5 min
Find how long it takes to go 7.5 km at 60 km/h
t = {{{7.5/60}}} = .125 hr which is 60*.125 = 7.5 min
therefore
7.5 - 4.5 = 3 min longer