Jawabanmu

2014-08-12T22:06:06+07:00
90 mil/jam(1 mil=1,6 km)
=144km/jam
=144:60:60
=144/3600
=1/25  meter/sekon

54 km/m
=54 x 60
=3240 km/jam
=3240 x 1000
=1800 kuadrat
=3240000:3600(dijadiin sekon)
=900m/s



2014-08-12T22:13:36+07:00
1 mil = 0,0001 m
1 jam = 3600 s
1 km = 1000 m
1 menit = 60 s

tinggal 90.0,0001 di per sama 3600
54.1000 di per sama 60