Challenging algebra problem
Dear Sir .
I need some help in the below questions .
Thanks very much
1) When Tom came to London, Kathy was as old as Baba and Tom together.
How old was Tom when Kathy was as old as Baba was when Tom came to London?
2)A swimmer was swimming upstream River A. Near the Bridge R he lost
A ball. After swimming 20 min more upstream he noticed his loss and
swam back to find the ball; he reached it near the Bridge S. Find the
velocity of current at River A if the distance between these two bridges
is 2 km. (Ans: 3 km/h).
How far has the swimmer travelled before he turned back to prick uo the ball.
A schematic diagram can be helpful.