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August 21, 2014

August 21, 2014

Posted by **Please help** on Thursday, January 27, 2011 at 9:53pm.

- Math -
**Reiny**, Thursday, January 27, 2011 at 9:58pmWhen the car overtakes the truck, they both would have traveled the same distance, except the truck took 1/4 hour longer

let the time taken by the car be x hours

then the time taken by the truck is x+1/4 hour

distance gone by car = 64x

distance gone by truck = 56(x+1/4)

but didn't we say those distances would be equal?

let me know what you got

- Math -
**Please help**, Thursday, January 27, 2011 at 10:04pm-2 but is that for the truck or car

- Math -
**helper**, Friday, January 28, 2011 at 12:21amThe time x cannot be negative. You must have made a mistake.

The two equations are,

distance gone by car = 64x

distance gone by truck = 56(x+1/4)

Since the distances are equal,

64x = 56(x + 1/4)

64x = 56x + 56/4

64x = 56x + 14

8x = 14

x = 1.75

From above (Reiny's explanation)

Since x = time taken by the car in hours, the car will overtake the truck in 1.75 hrs.

- Math -
**steven**, Tuesday, March 1, 2011 at 10:44pmA computer costs $799. To add memory it costs $25 for 8 megabytes. How much memory can you add if you have at most $1,000 to spend.

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