David and john started driving towards each other at 11 am and met each other at 2:30 pm on the same day. David and john started from different cities which are 420 miles apart. If davids average speed is 10 miles/hr lower than johns, what is the speed of at which john was driving, in miles/hr?
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420 = T * (V + (V - 10)) = 3.5 * (2 V - 10) using time traveled and speeds
120 = 2 V - 10
V = 65 John's speed and David's speed is 55
Check: 3.5 * 65 + 3.5 * 55 = 420
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