Question

A person complete 30km of a journey at 6 km/hr and the remaining 60 km in 7 hours. find his average speed

Answer 1

Answer :

Total distance travelled

= (30 + 60) km

= 90 km

and

Total time

= (30/6 + 7) hours

= (5 + 7) hours

= 12 hours

So, the average speed of the person

= (Total distance travelled)/(Total time)

= 90/12 km/h

= 7.5 km/h

#MarkAsBrainliest

Answer 2

${ \bf{ \underline{ \red{\underline{ \red{Question : - } }}}}}$

A person complete 30 km of a journey at 6 km/hr and the remaining 60 km in 7 hours. find his average speed.

${ \bf{ \underline{ \red{\underline{ \red{Solution : - } }}}}}$

{ Accirding to question }

Case 1 :- Distance covered by man with speed is as follow,

Distance = 30 km & Speed = 6 km/hr

Case 2 :- Distance covered by man in perticular time is as follow,

Distance = 60 km & Time = 7 hour

Now we need to find time for case 1 we use formula

${ \bf{ \dashrightarrow{Speed = \frac{ Distance }{Time} }}}$

${ \bf{ \dashrightarrow{6 = \frac{ 30 }{Time} }}}$

${ \bf{ \dashrightarrow{Time = \frac{ 30 }{6} }}}$

${ \bf{ \dashrightarrow{Time = 5 \: hour }}}$

5 hour taken by person to cover 30 km with speed 6 km/hr.

Now, to calculate average speed

${ \bf{ \small {\dashrightarrow{Average \: speed = \frac{ Total \: distance }{Total \: time} }}}}$

${ \bf{ \small {\dashrightarrow{Average \: speed = \frac{ 30+ 60}{5 + 7} }}}}$

${ \bf{ \small {\dashrightarrow{Average \: speed = \frac{ 90 }{12} }}}}$

${ \bf{ \small {\dashrightarrow{Average \: speed = 7.5 \:km/hr \: }}}}$

Hence average speed of person is 7.5 km/hr .