Question

a man crosses the river perpendicular to river flow in time T seconds and travels and equal distance down the stream in 30 seconds the ratio of man's speed in still water to the speed of river water will be ​

Answer 1

Answer:

speed of man in still water be 'v' and speed of river wrt ground be 'u' then the speed of man perpendicular is root

v2-u2 and it returns equal distance downstream is v+u so acc. to question

(root v2-u2)T =(v+u)t so from this answer will come t2+T2/t2-T2