Question

A man runs 10 km in 30 minute. What is his speed per hours?
a) 5 km / h
b) 10 km / h
c) 15 km / h
d) 20 km / h

Answer 1

$Heya$

30 Minute = 10km Travelled

60min = 10×2 =

Answer - 20Km / h....☺️

Answer 2

$\bf{A\: \: man\: \: runs \: \: 10\: \: km\: \: in\: \: 30 \: \:minutes. }$

Speed of the man is 10 km per half an hour.

as 1 hour = 60 seconds

so, 30 seconds = 1/2 hours

Hence,

$\frac{10}{ \frac{1}{2} } =10 \times \frac{2}{1} \\ \\ = 10 \times 2 = 20$

$\bf{(d) \: Hence,\: \: the \: \:speed \: \:of\: \: the\: \: man}$
$\bf{will\: \: be \: \:20 km/h}$