Question

A man runs at the speed of 9 m/s. How much time will he take to cover 750 meters?

Answer 1

$\longrightarrow\underline{\underline{\red{\sf{solution}}}}$

$\sf \: speed \: of \: the \: man = 9m/s$

$\sf \: time \: taken \: to \: cover \: 750 \: meters = x$

$\implies \sf \: time= \frac{distance}{speed}$

$\implies \sf \: \frac{750}{9} \times \frac{18}{5} \: m/s$

$\sf\implies \: \frac{15}{1} \times \frac{2}{1}$

$\sf \implies \: 15 \times 12$

$\sf \implies180 \: m/s$

$\sf∴if \: a \: man \: runs \: at \: the \: speed \\ \sf \: of \: 9 m/s . 180 \: secs \: he \: will \: take \\ \sf to \: cover \: 750 \: meters.$

Answer 2

Speed = 15 km per hour

Distance = 750 metres = 750/1000 km = ¾ km

Time = distance/speed = (3/4 ÷ 15) km

= (3/4 × 1/15) hr

= 1/20 hr

= 1/20 × 60 min = 3 minutes.