Trigonometric EquationHard

Question

A particle moves towards east from a point A to a point B at the rate of 4 km/h and then towards north from B to C at the rate of 5 km/h. If AB = 12 km and BC = 5 km, then its average speed for its journey from A to C and resultant average velocity direct from A to C are respectively

Options

A. km/h and km/h
B. km/h and km/h
C. km/h and km/h
D. km/h and km/h

Solution

         
Time T1 from A to B = = 3 hrs.
T2 from B to C = = 1 hrs.
Total time = 4 hrs.
Average speed = km/hr.
Resultant average velocity = km/hr.

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