A boy started from his house by bicycle at 10 a.m. at a

A boy started from his house by bicycle at 10 a.m. at a speed of 12 km per hour. His elder brother started after 1 hr 15 mins by scooter along the same path and caught him at 1.30 p.m. The speed of the scooter will be (in km/hr)

Let the speed of Scooter be x Distance covered by cycling in

3	1	hours = Distance covered by scooter in
	2

2	1	hours
	4

⇒ 12 ×	7	= x ×	9
	2		4

⇒ x =	12 × 7 × 2
	9

=	56	= 18	2	kmph
	3		3