John is walking east at a speed of 3 miles per hour, while Bob is also walking east, but at a speed of 5 miles per hour. If Bob is now 1 mile west of John, how many minutes will it take for Bob to catch up to John?
<spanclass=′latex−bold′>(A)</span>30<spanclass=′latex−bold′>(B)</span>50<spanclass=′latex−bold′>(C)</span>60<spanclass=′latex−bold′>(D)</span>90<spanclass=′latex−bold′>(E)</span>120