Time, Speed & Distance
Aptitude

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Q.

I travel the first part of my journey at 40 kmph and the second part at 60 kmph and cover the total distance of 240 km to my destination in 5 hours. How long did the first part of my journey last?

 A.

4 hours

 B.

2 hours

 C.

3 hours

 D.

2 hours 24 minutes

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Solution:
Option(C) is correct

The total time of journey = 5 hours.

Let '$x$' hours be the time that I travelled at 40 kmph

Therefore, $5–x$ hours would be time that I travelled at 60 kmph.

Hence, I would have covered $x\times 40+(5−x)60$ kms in the 5 hours = 240 kms.

Solving, for $x$ in the equation $40x+(5–x)\times 60=240$, we get

$40x+300–60x=240$

$⇒ 20x=60$ or $x$= 3 hours


(2) Comment(s)


Kuladeep
 ()

Total Distance is 250KM

First part of the journey is 120KM.

Distance = Speed * Time

120 = 40*Time

Time = 3 Hours


Kuladeep
 ()

Total Distance is 240KM. That was a typing mistake.