Messenger is allowed to take 16 hours for going from P to q to give something and back again including 4 hours rest at Q but if you were to go 2 kilometre an hour faster each way he would be able to take 5 hrs rest at q find the speed and distance from p to q
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Hii dude
Here is your answer mate :-)
When two bodies move in opposite direction, then the Relative Speed = Sum of Speeds i.e for e.g. for a person sitting in a train moving with a Speed of 40 km/hr in the west direction, another train which is going towards east with a Speed of 40 km/hr, will appear to move at a Speed of (40+40) = 80 km/hr.
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