Question

A gray whale traveled 152 kilometers in one day.The whale swam between 7 and 8 kilometers each hour.About how many hours did it take the whale to swim the distance? Show two different ways that you can use compatible numbers to find an answer.Then solve.

Answer 1

Let the number of hours whale swam be = n

Distance traveled by the whale in a day = 152 km

Speed of whale = 7 to 8 km per hour

As $time=\frac{distance}{speed}$

$n=\frac{distance}{speed}$

One time will be = $\frac{152}{7}=21.71$

Second time will be = $\frac{152}{8}=19$

Hence, the whale swam between 19 hours and 21.71 hours to travel 152 km.