A postal truck leaves its station and heads for Chicago, averaging 40mph. An error in the mailing schedule is spotted and 24 min. after the truck leaves, a car is sent to overtake the truck. If the car averages 50mph, how long will it take to catch the postal truck?

• 1 hr. 36 min.
  
  Distance traveled by truck in 24 min.=40*(24/60)=16 miles.
  After 1 hr. distance traveled by truck=(16+40)=56 m. & by car= 50 miles.
  As relative speed of truck & car= 50-40=10 mph
  So difference of 6 miles will be covered in 6/10 hours or 36 minutes.
  So car will catch the postal truck in 1 hr. & 36 min.
• 10 years agoHelpfull: Yes(3) No(0)