Problema Solution
Rob and Julie live 9.9 miles apart. Rob and Julie walk in the same direction. Rob catches up with Julie in 11 hours. What are their speeds?
Answer provided by our tutors
initially their distance = 9.9miles
let speed of rob = r
speed of julie = j
in order for rob catch up with julie, their walked distance must be the same but initally rob is 9.9 miels behind julie
therefore,
r=(d+9.9)/11
d=11r-9.9
j=d/11
d=11j
11j=11r-9.9
j=r-0.9
In this case, we cannot find their exact speed because lack of information
we only can know julie is slower than rob for 0.9 miles/hour