Question

12. A bus travelling at 42 km/h covers a distance in 5 h. How much ime would it save
increased its speed by 8 km/h?​

Answer 1

$\blue{\bold{\underline{\underline{Answer:}}}}$

$\green{\tt{\therefore{Saved\:time=0.8\:hour}}}$

$\orange{\bold{\underline{\underline{Step-by-step\:explanation:}}}}$

$\green {\underline \bold{Given : }} \\ \tt{: \implies Speed \: of \: bus = 42 \: kmh} \\ \\ \tt{: \implies Time = 5 \:h} \\ \\ \tt{: \implies Increased \: speed = 8 \: kmh} \\ \\ \red {\underline \bold{To \: Find: }} \\ \tt{: \implies Saved \: time \: when \: speed \: increase \: by \: 8 \: km \: h =?}$

• According to given question :

$\bold{As \: we \: know \: that} \\ \tt{: \implies Distance = Speed \times Time} \\ \\ \tt{: \implies Distance = 42 \times 5} \\ \\ \green{\tt{: \implies Distance = 210 \: km}} \\ \\ \bold{Time \: taken \: when \: speed \: increase} \\ \tt{: \implies Time = \frac{Distance}{Speed} } \\ \\ \tt{: \implies Time = \frac{210}{42 + 8}} \\ \\ \tt{: \implies Time = \frac{210}{50} } \\ \\ \green{\tt{: \implies Time = 4.2 \: h}}\\ \\ \bold{So \: saved \: time} \\ \tt{: \implies Saved \: time =( 5 - 4.2)h} \\ \\ \green{\tt{: \implies Saved \: time = 0.8 \: h}}$