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The car delivered the cargo from point A to point B, moving at average speed `mu_(1)=40km//h`. Turning back, the car was moving at an average speed of `v_(2)=60km//h`.A. The average speed of its movement all the way is `50km//hr`B. The average speed of its movement all the way is `52km//hr`C. The average speed of its movement all the way is 0D. The average speed of its movement all the way is `48km//hr` |
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Answer» Correct Answer - D `t_(1)=(x)/(40),t_(2)=(x)/(60)` `v_(av)=(2x)/(t_(1)+t_(2))=(2x)/((x)/(40)+(x)/(60))=(2xx60xx40)/(100)=48km//hr` |
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