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what is the relative motion of a mosquito in a moving bus of speed 80 km/s &velocity of mosquito is 25m/s.

Problem

One must take into account relative velocities to describe the motion of an airplane in the wind or a boat in a current. Assessing velocities involves vector addition and a useful approach to such relative velocity problems is to think of one reference frame as an "intermediate" reference frame in the form:

Put into words, the velocity of A with respect to C is equal to the velocity of A with respect to B plus the velocity of B with respect to C. Reference frame B is the intermediate reference frame. This approach can be used with the airplane or boat examples.

therefore the relative motion of the mosquito = 80+25 =102m/s