In covering a distance of 30 km, Arun takes 22 hours more than Anil. If Arun doubles his speed, then he would take 1 hour less than Anil. What is Arun's speed?
Select.
A) 8 kmph B) 5 kmph C) 4 kmph D) 7 kmph E) 9 kmph

Rationale: explanation : if arun doubles his speed , he needs 3 hour less . double speed means half time . hence , half of the time required by arun to cover 30 km = 3 hour i . e . , time required by arun to cover 30 km = 6 hour arun ' s speed = 30 / 6 = 5 kmph answer is b
Answer: B