Home » Aptitude » Speed, Time and Distance » Question
  1. Durga walks 5 km from her home to school in 60 minutes, then bicycles back to home along the same route at 15 km per hour. Her sister Smriti makes the same round trip, but does so at half of Durga’s average speed. How much time does Smriti spend on her round trip ?
    1. 120 minutes
    2. 40 minutes
    3. 160 minutes
    4. 80 minutes
Correct Option: C

Durga’s average speed =
2xy
kmph.
x + y
=
2 × 5 × 15
kmph
20

=
15
kmph
2

Distance of School = 5 km.
∴  Required time = 2
5
hours
15/4

=
2 × 5 × 4
hours
15

=
8
hours
3

=
8
× 60 minutes
3

= 160 minutes



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