to save fuel on the 240 km trip to the cottage, the Nakamura family reduce their usual average speed by 20 km/h. this lengthens their journey by 1 hour. what is the slower average speed?
i was told this question is not complete to answer? is that true?
normal speed ---- x km/h
time at normal speed = 240/x hours
reduced speed --- x-20 km/h
time at reduced speed = 240/(x-20)
solve:
240/(x-20) - 240/x =1
hint: multiply each term by x(x-2)
Yes, you are correct. The question as it stands is incomplete. In order to find the slower average speed, we need additional information. Specifically, we need to know the original average speed of the Nakamura family before they reduced their speed.
Once we have the original average speed, we can calculate the slower average speed by taking the difference between the original speed and the reduced speed.
Please provide the original average speed so that we can proceed with solving the problem.