Alvin is 5 years older than elga. the sum of their age is 85. what is elga age

40 years old.

Step-by-step explanation:

We can let Elga's age equal . Alvin's age can be equal to . We can make several equations from the information we know. We know that Elga's age plus five equal's Alvin's age.

We also know that the sum of their ages is 85.

We can substitute for in the second equation since , so we have the following equation:

We can combine like terms to get

Subtracting 5 from both sides results in

After that, we can divide both sides by 2 to get

Thus, Elga is 40 years old.

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step-by-step explanation:

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.