1.

A car covers 75 km of its journey at60 km/hr, the next 45 km at a speed of 30km/hr and the remaining part of the journey in 2 firs and 15 min. If the aver-age speed for the journey was 45 km/hr, how muchdistance was covered in the last part of the journey?a) 100 km c) 80 kmb) 90 km d] 180 km​

Answer»

Answer:

Let the TOTAL distance TRAVELLED be x KM Then total time taken =

10

x/3

+

20

x/3

+

60

x/3

=

30

x

+

60

x

+

180

x

=

180

6x+3x+x

=

180

10x

=

18

x

hrs Then AVERAGE speed = =

Totaltimetaken

Totaldistancetravelled

=

x/18

x

km/hr = 18 km/hr



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