In covering a distance of 60 km , Anil takes 2 hours more than Asif. If Anil doubles his speed , then he would take1 hr less than Asif . What is Anil's speed ?
Question
In covering a distance of 60 km, Anil takes 2 hours more than Asif. If Anil doubles his speed, then he would take 1 hour less than Asif. What is Anil's speed ?
Solution
Let's denote the speed of Anil as 'a' km/hr and the speed of Asif as 's' km/hr.
From the problem, we have two equations:
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60/a = 60/s + 2 (since Anil takes 2 hours more than Asif to cover the same distance)
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60/(2a) = 60/s - 1 (since if Anil doubles his speed, he would take 1 hour less than Asif)
Now, we can solve these equations to find the value of 'a' (Anil's speed).
First, simplify the equations:
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s = 60/a - 2
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s = 120/a + 1
Setting the two equations equal to each other gives:
60/a - 2 = 120/a + 1
Solving this equation for 'a' gives:
a^2 - 60a + 120 = 0
This is a quadratic equation in the form of ax^2 + bx + c = 0, where a = 1, b = -60, and c = 120.
We can solve this equation using the quadratic formula, x = [-b ± sqrt(b^2 - 4ac)] / (2a):
a = [60 ± sqrt((-60)^2 - 41120)] / (2*1) a = [60 ± sqrt(3600 - 480)] / 2 a = [60 ± sqrt(3120)] / 2 a = [60 ± 55.901] / 2
We have two possible solutions: a = (60 + 55.901) / 2 = 57.95 km/hr and a = (60 - 55.901) / 2 = 2.049 km/hr.
However, since Anil's speed cannot be greater than Asif's (because he takes more time to cover the same distance), the only feasible solution is a = 2.049 km/hr.
So, Anil's speed is approximately 2.049 km/hr.
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