Question

A car starts from A and B travelling 20 km an hour. 12 hours later another car starts from A and travelli
the rate of 30 km an hour reaches B 2 hours before the first car. Find the distance from A to B.
(a) 280 km
(b) 260 km
(c) 240 km
(d) none of these
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Answer 1

Answer:

let’s call them car1 and car2.

had they start together car2 would have reached (1.5+ 2.5) = 4 hour before car1.

Now in 4 hours car1 covers (20 X 4) = 80 km. So, car2 lead by 80 km in this time. Now, car2 get lead of (30–20) = 10 km/hour. So , to get 80 km lead they have to go for 80/10 = 8 hour. So car2 has taken 8 hour to go from A to B.

So, distance between A and B is (8 X 30) = 240 km.

Answer 2

Answer:

240

Step-by-step explanation:

i did rough work...in my notebook