13. A girl walks 12 km at the speed of 3 km/h. What change should she make in her speed to take (i) an hour less and (ii) an hour more to cover the distance?
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According to question, she takes one more hour to reach the distance. Therefore, new time will be 5 h. Therefore, she will reduce her speed from 3km/h to 2.4 km/h.
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A rectangular prism is a 3D figure with 6 rectangular faces. To find the volume of a rectangular prism, multiply its 3 dimensions: length x width x height. The volume is expressed in cubic units.
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