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.The boy is going to school by swimming at the rate of 2.5mph.The river's upstream is 2mph.How long will it take him to reach the
school?

• Distance between school and house=1/4 miles
  speed of boy=2.5mph
  speed of stream=2mph
  therefore speed upstream=(2.5mph-2mph)=.5mph
  time=(distance/speed)=(1/4miles/.5mph)=1/2 hour=30 mins
  
• 11 years agoHelpfull: Yes(2) No(1)