A shop keeper sells a badminton racket whose marked price is Rs 30, at a discount of 15% and gives a shuttle cock costing Rs. 1.50 free with each racket. Even then he makes a profit of 20% in racket. His cost price, per racket, is
A, B and C can individually complete a task in 24 days, 20 days and 18 days, respectively. B and C start the task, and they work for 6 days and leave. The number of days required by A alone to finish the remaining task is:
Two bullets were fired at a place at an interval of 28 min 30 sec. A person approaching the firing point in his car hears the two sounds at an interval of 27 mins. The speed of sound is 330 m/s. What is the speed of car?