When Alisha goes by car at 50 kmph, she reaches her office

When Alisha goes by car at 50 kmph, she reaches her office 5 minutes late. But when she takes her motorbike, she reaches 3 minutes early. If her office is 25 kms away, what is the approximate average speed at which she rides her motorbike ?

Difference of time = 5 + 3 = 8 minutes

=	8	hour =	2	hour
	60		15

If the speed of motorbike be x kmph, then

25	−	25	=	2
50	−	x	=	15

⇒	25	=	1	−	2
	x		2		15

⇒	25	=	15 − 4	=	11
	x		30		30

⇒ 11x = 25 × 30

⇒ x =	25 × 30
	11

=	750	= 68.18 kmph
	11

≈ 68 kmph