Question

Q.3A and B both travel through a distance of 20 kms. A travels at the speed of 8 kmph for half the distance and the remaining at 12 kmph; while B travels at a unor speed of
10 kmph. When B reaches destination, how for is A behind?
(d) None of these
a 1000 m
(b) 800 m
(c) 2000 m

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Answer 1

A is 1000m Left behind from B

Answer 2

Answer:

a) 1000 m

Step-by-step explanation:

B travels 20km at 10kmph speed, so the time taken is 2 hours.

Now, A travels 10km at 8kmph and 10km at 12kmhp speed.

A taking time for the first 10km is: (60/8)*10 = 75 minutes

So, next 45 minutes A speed is 12 kmhp.

Now A travels: (12/60)*45= 9km

So, when B reaches destination A is (20-(10+9))=1km=1000m

behind.