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Question -

Places A and B are 80 km apart from each other on a highway. A car starts from A and other from B at the same time. If they move in the same direction, they meet in 8 hours and if they move in opposite directions, they meet in 1 hour and 20 minutes. Find the speeds of the cars. [CBSE 2002]



Answer -

Distance between A and B = 80 km
One car starts from A and other from B in the same direction and they meet after 8 hours
Let the speed of the first car = x km/hr
and speed of second car = y km/hr
Distance travelled by the first car = 8x km
and by the second car = 8y km
8x – 8y = 80
=> x – y = 10 ….(i)
When the two cars move in opposite direction, they

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