Chemistry Conversions 1) 5.01*10^6 m/hr→mm/sec 2) 9.30*10^8 cm/sec→Km/min

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the key thing is to convert the units, so I'm going to leave out the number before the units since that won't change so you can just multiply it later1)  m/hr-> mm/sec.  1st, I want to get rid of the m on top and replace it w/mm.  In math, you can always multiply by 1.  In the details you said 1m=1000mm, so 1=1000mm/1m.m/hr (1000mm/m)= 1000mm/hr.  2nd, to change hr into sec, I do the same thing (1hr=3600sec, so 1hr/3600=1)1000mm/hr (1hr/3600 sec)=1000mm/3600sec=(1/3.6) mm/secplugging back in the constant:5.01x10^6/3.6 mm/sec= 1.39 x10^6 mm/sec2)cm/sec-> km/min -change Km to m to cmcm/sec (1km/1000m)=km*cm/1000m*seckm*cm/1000m*sec (1m/100cm)=1km*cm*m/1x10^5m*sec*cmkm/1x10^5 sec  to get rid of seckm/1x10^5 sec (60 sec/min)= 6x10^-4 km/minplug in the constant from the beginning:9.3x10^8(6x10^-4) km/min=55.8x10^4 km/min=5.58x10^5 km/min