at a bakery, three pastry chefs are icing cupcakes for a large gala event. The first chef can ice 7 cupcakes in 5 minutes. The second chef can ice 18 cupcakes in 1/3 of an hour . The third chef ices one cupcake every 50 seconds. How long would it take The three chefs, working together, to ice 500 cupcakes? please round to the nearest second.