9 hundreds + 4 ten thousands + 8 ones + 7 tens

40978

Step-by-step explanation:

a hundred =100

so, 9 hundreds =9×100=900

ten thousand =10000

4 ten thousands =40000

8 ones=8×1=1

1ten=10

7 tens=7×10=70

so,9 hundreds + 4 ten thousands + 8 ones + 7 tens=900+40000+8+70

=40978

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles