There is a river. A boy's house is at the river bank and his school is on the other side of the river. The distance between house and school is 1/4 miles.Theboy is going to school by swimming at the rate of 2.5mph.Theriver's upstream is 2mph.How long will it take him to reach the school?

• distance=1/4 miles=0.25 miles
  the speed of boy in upstream=(2.5-2)mph=0.5mph
  time taken=0.25/0.5=1/2 hr=30 minutes
  
• 11 years agoHelpfull: Yes(36) No(4)