Time and Distance Subir das সময় ও দূরত্ব সুবীর দাস।
time and distance, somai dutotto, wbpmath, kpmath, wbcsmath, smartmath, bookhack
Chapter 17A (Ratio and Proportion) https://youtu.be/0Eia-9r_h1M
Chapter 17B (Ratio and Proportion) https://youtu.be/TnDJSUMxUmY
Chapter 17C and 17D (Ratio and Proportion) https://youtu.be/LmMaqsT-lHo
Chapter 18 (Partnership) https://youtu.be/GxOKrGAbEpk
Chapter 19 (Average)
Chapter 20 (Time and Work) https://youtu.be/gAyvlg22Nzg
Chapter 21 (Pipe and Cistern) https://youtu.be/3A1pvmRHryE
Chapter 22 (Time and Distance) https://youtu.be/mxOeFi6IyL8
Chapter 23 (Time and Distance about Train) https://youtu.be/yq-0ENiYync
Chapter 24 (Boat and Stream) https://youtu.be/m2FDgaucPfw
Chapter 25 (Percentage) https://youtu.be/4E1MD5HfQ4k
Chapter 26 (Profit and Loss) https://youtu.be/VZw14QflNtw
Chapter 27 (Simple Interest) https://youtu.be/K8q0LS7tq7Y
Chapter 28 (Compound Interest) https://youtu.be/2amoOzKki58
Chapter 29 (Mixture) https://youtu.be/zDcL54iX3FI