# Solution: How fast in kph is the distance between the two trains changing at 4:00 PM?

Two railroad tracks are perpendicular to each other. At 12:00 PM there is a train at each track approaching the crossing at 50 kph, one being 100 km and the other 150 km away from the crossing. How fast in kph is the distance between the two trains changing at 4:00 PM?

#### Problem Statement: CE Board May 1996

Two railroad tracks are perpendicular to each other. At 12:00 PM there is a train at each track approaching the crossing at 50 kph, one being 100 km and the other 150 km away from the crossing. How fast in kph is the distance between the two trains changing at 4:00 PM?
• A. 67.08 kph
• B. 68.08 kph
• C. 69.08 kph
• D. 70.08 kph

The distance between the two trains changing at the rate of 67.08 kph

Solution:

### Latest Problem Solving in Differential Calculus (MAXIMA-MINIMA & TIME RATES)

More Questions in: Differential Calculus (MAXIMA-MINIMA & TIME RATES)

#### Search! Type it and Hit Enter

 We educate thousands of students a week in preparation for their licensure examinations. We provide professionals with materials for their lectures and practice exams. To help us go forward with the same spirit, contribution from your side will highly appreciated. Thank you in advance. Option 1 : \$5 USD Option 2 : \$10 USD Option 3 : \$15 USD Option 4 : \$20 USD Option 5 : \$25 USD Option 6 : \$50 USD Option 7 : \$100 USD Option 8 : Other Amount