Two people move towards each other from two places 55 km apart. One moves at speed of 12 km/hr and other at 10 km/hr. They will be first 11 km apart after moving how many hours?
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Answer:
North and east are at 90 degree, equation becomes
(2x
2
)+[2(x+5)]
2
=50
2
on solving, we get
x=12.366km/h
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