Question

Ajay's driving speed for a 6 hour trip was 65 km/h. during his journey, for first 4 hours, he drove 60 km/h. what was his speed for the last 2 hours of the trip ?

Answer 1

Ajay's Avg driving speed for the trip = 65km/hr
time =6hr
distance = 65*6 = 390km
first 4 hrs speed = 60km hr
first 4 hrs dist. = 4*60 = 240kms
dist. left = 150 km
speed = dist/time
=150/2
=75kms/hr

Answer 2

Ajay has to travel a total distance = 65×6=390km
in the 4 hours when he was moving with 60kmh-1
he had covered a distance of 4×60=240km
the rest distance has to be covered=390-240
=150km
speed =distance/time=150/2=75km/h