Home » Aptitude » Speed, Time and Distance » Question
  1. A car travelling with
    5
    of its usual speed covers
    7
    42 km in 1 hour 40 min 48 sec. What is the usual speed of the car?
    1. 17
      6
      km/hr
      7
    2. 35 km/hr
    3. 25 km/hr
    4. 30 km/hr
Correct Option: B

1 hr 40 min 48 sec

= 1 hr 40 +
48
min
60

= 1 hr 40 +
4
min
5

= 1 hr
204
min
5

= 1 +
204
hr
300

=
504
hr
300

∴  Speed =
42
504
300

= 25 kmph
Now,
5
×usual speed = 25
7

∴  Usual speed =
25 × 7
5

= 35 kmph



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