A person is running along a circular track of area 625 m^{2} (=22/7) with a constant speed. Find the displacement in 15 seconds if he has to complete the race in 30 sec.

A person is running along a circular track of area 625 m^{2} (=22/7) with a constant speed. Find the displacement in 15 seconds if he has to complete the race in 30 sec.

A car travels 40 km at an average speed of 80 km/h and then travels 40 km at an average speed of 40 km/h. The average speed of the car for this 80 km trip is 

(a) 
40 km/h 
(b) 
45 km/h 
(c) 
48 km/h 
(d) 
53 km/h 
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