Quadratic equations word problems (intermediate)

Paritosh took a trip on a boat that took him $10$‍ hours. He travelled $30\text{km}$‍ upstream and $44\text{km}$‍ downstream to reach his destination.

The constant speed of the stream is $3{\displaystyle \frac{\text{km}}{\text{hr}}}$‍.

Let $b{\displaystyle \frac{\text{km}}{\text{hr}}}$‍ be the constant speed of the boat in still water.