742. Нишон дихед, ки \( 2 a-b-(2 b-a)-3(a-b) \)

A straight highway connects Town A and Town B, a distance of 45 kilometres, Andy started biking along the highway from Town A to Town B at 8:00 AM at a constant speed of 3 kilometres per hour. Ben started biking on a parallel highway from Town B to Town A at 9:00 AM at a constant speed of 4 kilometres per hour. How many kilometres had Ben biked when they met along the way?

Given \( \left(\begin{array}{ll}1 & 6 \\ 7 & 2\end{array}\right)\binom{r}{3}=\binom{y}{y} \). Determine the values of \( r \) and \( y \). \( \begin{array}{ll}\mathbf{A} \quad r=20, y=2 & \text { C } r=4, y=9 \\ \text { B } r=2, y=20 & \text { D } r=9, y=4\end{array} \)

Without actually calculating, find the value \( (-10)^{3}+(7)^{3}+(3)^{3} \) వాస్తవ గణన చేయకుండానే \( (-10)^{3}+(7)^{3}+(3)^{3} \) యొక్క విలువ కనుక్కోఁ

4. Two almirahs are purchased for \( 27,800 . ₹ 200 \) was spent on the transportation. One of them is sold at a profit of \( 40 \% \) and the other one at a loss of \( 40 \% \). If the selling price was same in both the cases, find the cost price of each alminh?

4. Math on the Spot Solve each system by substitution. \( \begin{array}{ll}\text { A. }\left\{\begin{array}{l}y=3 x \\ y=x+4\end{array}\right. & \text { B. }\left\{\begin{array}{l}x-y=4 \\ x+2 y=4\end{array}\right.\end{array} \)