The motorboat can go 14 miles downstream on the river in 20 minutes. It takes 30 minutes for this boat to go back upstream same 14 miles. Determine speed of boat. Cheryl is three years more than three times as old as Ben. In 20 years sum of their ages will be 87. How old is Ben now? The eastbound train leaves Vancouver for Toronto, distance of about 4370 km, travelling at about 90km/h. At the same time west bound train leaves Toronto to Vancouver travelling at about 70 km/h. How far from Toronto are trains when they pass each other? For how long have they been travelling?