Speed difference between Zong 4G (LTE) and normal 3G

What is the speed difference between Zong 4G (LTE) and normal 3G available in Pakistan?

Zong 4G (LTE) will offer speeds of up to 150 Mbps while normal 3G offers speeds of up to 21 Mbps. So Zong 4G (LTE) is approximately 8 times faster than normal 3G.