Question

Some friends are leaving a party in Hillsdale to go home. One group takes a taxi uptown, travelling north at 47 kilometres per hour. The rest of the friends share another taxi, travelling south at 65 kilometres per hour. If the two taxis depart at the same time, how much time will pass before they are 19 kilometres apart?

Answer 1

since distance = speed * time,
47x + 65x = 19