If a car travels 150 kilometer north for 2 hours and then it goes to travel and covered 100 kilometers going south for 1.5 hours, what is its average speed in kph and in m/s A.19.86 m/s
B.20m/s
C.13 m/s
D. None of the Above

330 wpu is be the right temperature

Answervery cold;

Jenny and fred both play a long note on their trombones. a stationary observer hears the sound increasing and decreasing repeatedly in loudness. which of these must be true? the sound waves from the two trombones have slightly different frequencies.the sound waves from the two trombones have the same frequency.the sound waves from the two trombones have slightly different amplitudes.the sound waves from the two trombones have the same wavelength.the sound waves from the two trombones have slightly different velocities.  lolthe answer is          the sound waves from the two trombones have slightly different frequencies.