train express train r makes a run of of 240 km at a certain speed another train whose speed is 12 km per hour less than an hour longer to cover the same distance find the speed of the express train in km hr
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Very easy
Let speed of first train be x
Time = distance/speed
Time = 240/x...............eq(1)
Now second condition
Second train speed = x - 12
Time = 240/x +12...........eq(2)
From eq 1 and 2
240/x+12 + 1 = 240/x
(240+x+12)x = 240(x + 12)
240x + x^2 + 12x = 240x + 2880
X^2 + 12x - 2880 = 0
By solving this quadratic equation youl will get required value of x
Let speed of first train be x
Time = distance/speed
Time = 240/x...............eq(1)
Now second condition
Second train speed = x - 12
Time = 240/x +12...........eq(2)
From eq 1 and 2
240/x+12 + 1 = 240/x
(240+x+12)x = 240(x + 12)
240x + x^2 + 12x = 240x + 2880
X^2 + 12x - 2880 = 0
By solving this quadratic equation youl will get required value of x
anurag0804rathore:
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