linear equation problem solving
Need help on these questions..
question 1- show that 2/c = 1/a+1/b
2ab=bc + ac...
question 2 - Xiu travels from town A to B at u km/h and then returns at v km/h. Town A is d km from town B
a) if i t takes T hours to travel from A to B, find the time taken:
i) the entire trip in terms of T, u and v
time = distance/ speed
u + v =speed back and forth
distance is d km
so d/u+v ??
question 3- A man walks 70 km. He walks x km at 8 km/h and y km at 10km/h
a) fins his average speed in terms of x and y.
average speed is = distance/ time