1.

Place A and B are 30km apart and they are on a straight road hamid travel from A go B

Answer»

Hola!
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Let the speed of JOSEPH = x km/h

Let the speed of Hamid = y km/h

Case 1. ]
Approaching one another, combined speed = (x+y)km/h

Time TAKEN to meet = 30/(x+y) = 1/3  (20 minutes = 1/3 hours)

x+y = 90 ------ [ i ]

Case 2. ]
When moving in opposite direction, combined speed = (x-y)km/h

Time taken for Hamid to CATCH up = 30/(x-y) = 3

x-y = 10 ----[ ii ]

Solving [ i ] and [ ii ] simultaneously,

x = 40
n'
y = 50

Hence,

Speed of Joseph = x = 40km/h
Speed of Hamid = y = 50km/h

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Hope it helps! :D


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