Can someone solve this arithmetic problem for me?
I was going through a book called Teach Yourself “Mathematics” by L.C Pascoe and came across this problem:
A plane has to fly a distance of 2850 miles in six hours. After 3½ hours’ travel, it is found that the average speed made good has been 436 m.p.h. What must be the speed made good for the rest of the journey in order to arrive on time? (The speed made good is the speed over the surface of the earth; this is the one that is important. It is derived from air speed and wind velocity.
Please explain the method to solving problems like these.
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