Sherry S. answered 09/18/16
Tutor
4.9
(89)
Because no one should have to say, "I was never any good at math."
Every hour, they are an additional 150 km apart (80 km/hr + 70 km/hr). So, 900 km ÷ 150 km = 6 hours
Stephanie K.
09/18/16