A car completes a journey at an average speed of 40 km/h. At what speed must it travel on the return journey if the average speed for the
complete journey (out and back) is 60 km/h?

The dolphins at the webster are fed 1/2 of a bucket of fish each day the sea otters are fed 1/2 as much fish as the dolphins how many buckets of fish are the sea fed each day? simplify you answer and write it as a proper fraction or as a whole or mixed number

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

Is the number 128.439 a rational number