Math distance per unit???

Question

here it is...

Mary completes a 5 mile race in 32 minutes and 47 seconds. Compute her average speed in a) miles per minute b) miles per hour c)meters per second d) kilometers per hour

a little explanation would be greatly appreciated =)

thanks =)

Answer 1

Mary completes a 5 mile race in 32 minutes and 47 seconds. Compute her average speed in a) miles per minute b) miles per hour c)meters per second d) kilometers per hour

IN2U2 we can not get the average Speed because there is no variation of Speed given.

But we can get Marys Speed

Time = 32 min & 47 sec

there are 1 min = 60 sec

Time = 32 min & 47 sec x 1/ 60 sec

Time = 32.783 min

a)  5/32.783

=> 0.153 mile/min ◄ ans

1hour = 60 min

Time = 32.783 min x 1hr /60min

Time = 0.55 hr

b).  mile per hour

=> 5 / 055

=>  9.09 mile/hr ◄ ans

Time = 32.783 min x 60 sec /min

Time = 1966.98 Sec

1609.27 meter = miles

Distance conversion = 5 miles x 1609.27 meter/mile

=> 8046.35 meters

c)meters per second

Speed = 8046.35 / 1966.98 Sec

=> 4.09 meter per sec ◄ ans

1km = 1000 meter

Distance = 8046.35 meter x Km/1000

=> 8.04635 Km

d) kilometers per hour

Speed = 8.04635 Km / 0.55 hr

=> 14.63 Km/hr ◄ ans

hope this helps