If speed of stream on Thursday is 20% less than the speed of | Data Interpertation & airthmatic

If speed of stream on Thursday is 20% less than the
speed of stream on Monday and speed of boat A in still
water on Monday is 40% more than speed of boat B in
still water on Monday, then what is the speed of boat A
in still water on Monday if ratio of upstream journey
times of boats A and B on Monday is 8/11?
a) 35 km/h
b) 40 km/h
c) 42 km/h
d) 45 km/h
e) Other than above.