Walking at 3 of his usual speed a man is late by4 21 hours.

Walking at 3 of his usual speed a man is late by
4

2 1 hours. The usual time would have been what?
2

New speed is	3	of the usual speed
	4

∴ New time taken =	4	of the usual time
	3

∴	4	of the usual time – Usual time =	5
	3		2

⇒	1	of the usual time =	5
	3		2

∴ Usual time =	5	× 3
	2

=	15	hours or 7.5 hrs
	2

2	1	hours. The usual time would have been what?
	2