Raju takes 1.5 hours more than Ramu for covering a distance of 20 km. If Raju doubles his speed, then he would take 1 hour less than Ramu. Raju's speed is:
Solution: Let Raju's speed be x km/hr.
Then, 20/x - 20/2x = 2.5
=> 20 = 2x*2.5
=> x = 20/5 = 4 km/hr.
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