train is booked to do Run between two places 55 km in 1 hour 20 minutes if I travel the first 30 kilometre at 36 kilometre at an hour at what speed must a travel for the rest of distance in order to complete the journey in time
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Speed = distance / time
36 = 30 / t
t = 30/36
= 5/6 hours
= 50 minutes
Remaining time = 80 - 50
= 30 minutes
= 0.5 h
Remaining distance = 55 - 30
= 25 km
Required speed = 25 / 0.5
= 50 kmph.
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