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You have :
dD = dH = 80 mi VD = 20 mi/h

tH = tD - 90 min = tD - 1.5 h

dD = ( VD ) ( tD )

80 mi = ( 20 mi/h ) ( tD ) ----> tD = 4 h

dH = ( VH ) ( tH ) = ( VH ) ( tD - 1.5 h )

80 mi = ( VH ) ( 4h - 1.5 h ) = ( VH ) ( 2.5 h ) ----> VH = 32 mi/h <-----------------------

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