1．When Cheenu was a boy he could run 15 miles in 3 hours and 30 minutes.As an old man he can now walk 10 miles in 4 hours.How many minutes longer does it take for him to walk a mile now compared to when he was a boy？（　?。?br />當(dāng)Cheenu還是個(gè)男孩時(shí)，他可以在3小時(shí)30分鐘內(nèi)跑15英里。作為一個(gè)老人，他現(xiàn)在可以在4小時(shí)內(nèi)走10英里。現(xiàn)在他走一英里所需的時(shí)間比他小時(shí)候多多少分鐘？（　?。?/div>

2．On a trip to the beach,Anh traveled 50 miles on the highway and 10 miles on a coastal access road.He drove three times as fast on the highway as on the coastal road.If Anh spent 30 minutes driving on the coastal road,how many minutes did his entire trip take？（　?。?br />Anh去海灘的路上在高速公路上行駛了50英里，在沿海通道道路上行駛了10英里。他在高速公路上的速度是在沿海道路上的三倍。如果Anh在沿海道路上行駛了30分鐘，那么他整個(gè)行程需要多少分鐘？（　?。?/div>

3．Jack and Jill are going swimming at a pool that is one mile from their house.They leave home simultaneously.Jill rides her bicycle to the pool at a constant speed of 10 miles per hour.Jack walks to the pool at a constant speed of 4 miles per hour.How many minutes before Jack does Jill arrive？（　　）
Jack和Jill要去他們家一英里外的游泳池游泳。他們同時(shí)離家出發(fā)。Jill騎自行車以每小時(shí)10英里的恒定速度到游泳池。Jack以每小時(shí)4英里的恒定速度走到游泳池。Jill比Jack早到達(dá)多少分鐘？（　?。?/div>