Question

9.
Two person A and B, 72 km apart, travels in opposite direction with a speed of 36 kmph and 24kmph
respectively however A leaves at 6 am and B leaves at 7:30 am when are they 12 km apart? (Indicate All
Choices
(A) 7:36am (B) 8:00am (C) 8:08am (D) 7:48am
(E) none of these

Answer 1

Answer:

Answer is (B)

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Answer 2

Answer:

A , B

Step-by-step explanation:

First calculate distance travelled by A during 6 am to 7:30 am that comes 54

Thus they are (72-54 = 18 )18 km away at 7:30.

Now, because they are moving in opposite direction,

Relative speed 36+26 = 60kmph (we will be using this to calculate time)

Distance when 12 away

d= 6km (18-12).

Time = 6/60hr =6min

therefore 7:30+6 = 7:36 am

But don't forget to calculate time when they cross eachother and are 12 away

That is d = 18+12= 30 km .

Time = 30 / 60 = 30 min hence,

7:30+30min=8:00am

Hope this helps.:)