SOLUTION: At 3:00 p.m. A plane leaves London for Madrid, 1260 km away. At 4 p.m. A plane leaves Madrid to fly to London. The second plane flies 40 kph faster than the first. If the planes pa
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Question 894707: At 3:00 p.m. A plane leaves London for Madrid, 1260 km away. At 4 p.m. A plane leaves Madrid to fly to London. The second plane flies 40 kph faster than the first. If the planes pass each other at 4:30 p.m. What is the speed of each plane? Thank you for your help.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the speed of the 1st plane in km/hr
= the speed of the 2nd plane in km/hr
----------------------
Between 3 PM and 4 PM, the 1st plane travels
----------------
Start a stopwatch when the 2nd plane leaves at 4PM
They are now km apart
---------------------------------
Think of one plane as flying at the sum of their speeds and the
2nd plane standing still
Their speeds were 620 km/hr and 660 km/hr
-------------------
check answer:
For 1st plane:
(1)
(1) km
For 2nd plane:
(2)
(2) km
----------------------
km
and
km
OK
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