a car driver has to cover a total distance of 300 kms. in 6 hours. he travels at the rate of 60 kmph. for first 90 minutes and next 100 kms. at the rate of 50 kmph. at what average speed must he travel now in order to complete the journey in 6 hours?
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90 mins =90/60 hrs =1.5 hrs
Distance travelled in 90/60 hrs=s*t
=60*90/60 =90 km
Time taken to travel 100 km =D/S
=100/50 =2 hrs
Total time taken =(2+1.5) hrs =3.5 hrs
Time left (6-3.5) =2.5 hrs
Distance left =300 -(100+90) =110 km
So his speed mist be to finish his journey in 6 hrs=D/T=110/2.5
=44 km/h ANS
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