Question 814599
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Hi,
 What time will he be in school
house is 30 km away, leaves his house at 6:30 a.m. 
and travels at an average speed of 40 km/h ?
D = rt, 0r t = D/r,  t = {{{30km/40mph = 3/4}}}
 3/4 hr is 45min
Arrive at school  at 7:15 am!