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  1. A man completes 30 km of a journey at the speed of 6 km/hr and the remaining 40 km of the journey in 5 hours. His average speed for the whole journey is
    1. 7 km/hr
    2. 6
      4
      km/hr
      11
    3. 8 km/hr
    4. 7.5 km/hr
Correct Option: A

Time taken to cover 30km at 6 kmph =
30
= 5 hours
6

Time taken to cover 40 km = 5 hours
∴  Average speed =
Total distance
Time taken

=
30 + 40
10

=
70
= 7 kmph
10


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