A student on the west side of a river that flows from north to south at 1.17 m/s. He wants to swim across the river from point A and arrive at point B. He can swim at a speed of 1.35 m/s in a swimming pool. If the river is 163 m wide, it will take him abc seconds to reach point B. . Input your value for abc in the blank . Include a negative sign if your answer is negative . Do not include a positive sign if your answer is positive. . Do not include units river width Point A Point B current