Abhi rows upstream a distance of 28 km in 4 h and rows downstream a distance of 50 km in 2 h. To row a distance of 44.8 km in still water, he will take:

Let the speed of boat be x and speed of stream be y.
Abhi rows upstream a distance of 28 km in 4 h.
So, speed in upstream = 28/4 = 7 km/hr
x - y = 7 ---(1)
Abhi rows downstream a distance of 50 km in 2 h.
So, speed in downstream = 50/2 = 25 km/hr
x + y = 25 ---(2)
On eq (1) + (2),
2x = 32
x = 16
Time taken to row a distance of 44.8 km in still water = 44.8/16 = 2.8 hr
$$\therefore$$ The correct answer is option A.