In covering a distance of 30 km, Amla takes 2 hours more than Peter. If Amla doubles his speed, then he would take 1 hour less than Peter. Amla’s speed is :  Choose the correct choice from the following answers:	A) 7 kmph	B) 6.5 kmph	C) 5.5 kmph	D) 5 kmph	E) None
Sol.   Let Peter’s speed be x km/hr.   Then, 30/x - 30/2x = 3   ⇔ 6x = 30   ⇔ x = 5 km/hr   Answer 5 kmph
<result>D</result>
In covering a distance of 30 km, Amla takes 2 hours more than Peter. If Amla doubles his speed, then he would take 1 hour less than Peter. Amla’s speed is :