6 .In questions, some equations are solved on the basis of a certain system. On the same basis, find out the correct answer for the unsolved equation 5 $\times$ 6 $\times$ 4 = 456, 3 $\times$ 6 $\times$ 5 = 536, 4 $\times$ 8 $\times$ 7 = ?
7 . A cyclist goes 30 km to North and then turning East he goes 40 km. Again he turns to his right and goes 20 km. After this, he turns to his right and goes 40 km. How far is he from his starting point ?
10 . One morning at 7 o'clock, Naresh started walking with his back towards the Sun. Then he turned towards left, walked straight and then turned towards right and walked straight. Then he again turned towards left. Now in which direction is he facing ?