marygailbowen3164 marygailbowen3164 28-02-2024 Physics contestada A man can swim with a speed of 4.0 km/h in still water. How long does he take to cross a river 1.0 km wide if the river flows at 2.0 km/h? a) 30 minutes b) 45 minutes c) 1 hour d) 1 hour 15 minutes