Sam and Colin drove from City A to City B. Sam reached City B in
16 hours. Colin left 6 hours later than Sam and reached City B at
the same time as Sam. The difference between their average speed
was 30 km/h.
(a) Find the distance Sam had travelled when Colin left City
A.
(b) Find the distance between the 2 cities.
Time Sam taken = 16 hours
Time Colin taken = 16 - 6 = 10 hours
Difference in speed = 30km/h
Distance which Colin travelled more than Sam in 10 hours = 30km
X 10 = 300km
Distance travelled when Colin left City A = 300km
= > Sam's speed = 300km / 6 hours = 50km/h
Distance between cities = 50km X 16 = 800km