Simplify the radical expression by rationalizing the denominator 2/sqrt 42

2/sqrt 42

Multiply both the numerator and denominator by sqrt 42 to clear the radical.
2/sqrt42 * sqrt42/sqrt42 =
2sqrt42/42 =
sqrt42 / 21

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.