Develop a class bankaccount that supports these methods: • : , or to 0 if no input argument is given • withdraw(): takes an amount as input and withdraws it from the balance • deposit(): takes an amount as input and adds it to the balance • balance(): returns the balance on the a

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2