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6. A car travels from a place A to B in 7 hour. It covers half the distance at 30 kmph and the remaining distance at 40 kmph, what is the total distance between A and B?

7. Two vans start from a place with a speed of 50 kmph at an interval of 12 minutes. What is the speed of a car coming from the opposite direction towards the place if the car meets the vans at an interval of 10 minutes.

8. A and B set out at the same time to walk towards each other respectively from a place P and Q 144 km apart. A walks at the constant speed of 8 km/h, while B walks 4 km in the first hour, 5 km in the second hour, 6 km in the third hour and so on. Then the ''A'' will meet ''B'' at?

9. Sofi started traveling from a place A to B and priya started traveling from a place B to A which are 576 km apart. They meet after 12 hours, after their meeting, sofi increased her speed by 2 km/hr and priya reduced her speed by 2 km/hr, they arrived at B and A respectively at the same time. What is their initial speed?

10. A boat takes 28 hours for traveling downstream from point A to point B and coming to point C midway between A and B. If the velocity of the stream is 6 km/hr and the speed of the boat in still water is 9 km/hr, what is the distance between A and B?