Question

How many miles/hour is 30 km/s?

Answer 1

You can use dimensional analysis.
`(30 km)/(1 s) (1000 m)/(1 km) (100 cm)/(1 m) (1 in)/(2.54 cm) (1 ft)/(12 in) (1 mi)/(5280 ft) (60 s)/(1 min) (60 min)/(1 hr)=`
`(10800000000 mi)/(78638.4 hr) or (137337.484 mi)/(1 hr)`