Home » Aptitude » Speed, Time and Distance » Question
  1. A person covers 10 kms at 4 km per hr. and then further 21 kms at 6 km per hr. Find his average speed for whole journey.
    1. 5
      1
      kmph
      3
    2. 5
      1
      kmph
      6
    3. 5
      1
      kmph
      2
    4. 4
      1
      kmph
      2
Correct Option: B

Case I.
Distance = 10 kms
Speed = 4 km/hr.

∴  Time taken (t2) =
21
=
7
hrs.
62

Total time taken =
5
+
7
22

=
5 + 7
= 6 hrs.
2

Total distance covered
= 10 + 21 = 31 kms
∴   Average Speed =
Total distance
Total time

=
31
km per hr.
6

= 5
1
km per hr.
6


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