Ricky leaves school to walk home. His friend, Mariah, notices 0.5 hours later that Ricky forgot his phone at the school. So Mariah rides her bike to catch up to Ricky and give him the phone. If Ricky walks at 4 mph and Mariah rides her bike at 8.9 mph, find how long (in hours) she will have to ride her bike until she catches up to him. Round your answer to 3 places after the decimal point (if necessary) and do NOT type any units (such as "hours") in the answer box. Time for Mariah to catch up to Ricky: hours

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