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:

4 km/hr.

5 km/hr

6 km/hr

3 km/hr

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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