Ryans speed --- x mph
Gabr. speed --- x+42
Gabr time was clearly 2 hours and Ryans time must have been 5 hours
5x = 2(x+42) , using D = RT
5x = 2x + 84
3x = 84
x = 28
Ryan's speed = 28 km/h
check:
distance must have been 5(28) = 140 km
Ryan;s time = 140/28 = 5 hrs
Gabrielle's time = 140/70 = 2hours, makes sense!
Ryan left the science museum and drove south. Gabriella left three hours later driving 42 km/h faster in an effort to catch up to him. After two hours Gabriella finally caught up. Find Ryan's average speed!
My teacher says we have to show all of the work and set up an equation through the d=rt process!
1 answer