Home » Aptitude » Speed, Time and Distance » Question
  1. You arrive at your school 5 minutes late if you walk with a speed of 4 km/h, but you arrive 10 minutes before the scheduled time if you walk with a speed of 5 km/h. The distance of your school from your house (in km) is
    1. 4
    2. 5
    3. 10
    4. 2
Correct Option: B

If the required distance be = x km, then

x
x
=
10 + 5
4560

⇒ 
5x − 4x
=
1
204

⇒ 
x
=
1
204

⇒ x =
1
× 20 = 5 km.
4


Second Method :
Here, S1 = 4, t1 = 5
S2 = 5, t2 = 10
Distance =
(S1 × S2)(t1 + t2)
S1 − S2

=
(4 × 5)(5 + 10)
5 − 4

= 20 ×
15
= 5 kms
60



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