Question

Need the help of maths genius

Answer 1

let the distance covered be x km and speed of boat be y km/hr
according to the ques
x/y-3=6
x=6y-18
x/y+3=4
x=4y+12
substitute the value of x
6y-18=4y+12
2y=30
y=15km/hr
so therefore x=6y-18
x=72km