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CBSE Class 10 Answered

Find their speeds
Asked by fathima12 | 13 Sep, 2010, 10:50: PM
answered-by-expert Expert Answer
Let X and Y be the speeds of Ajeet and Amit respectively.
time = distance/speed
30/X = 30/Y + 2   .. (1)
Hence Ajeet takes 30/X, hrs while Amit takes 30/Y.
If 2X, then 30/(2X) = 30/Y - 1
15/X - 30/Y = - 1  .... (2)
Put 1/X = x and 1/Y = y in (1) and (2).
30x - 30y = 2
15x - 30y = - 1
Solving these simultaneously we find,
x = 1/5 i.e. X = speed of Ajeet = 1/x = 5 km/hr.
y = 2/15 i.e. Y = speed of Amit = 1/y = 15/2 = 7.5 km/hr.
regards,
Team,
TopperLearning.
Answered by | 14 Sep, 2010, 07:07: AM

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