Johnny drove at 32 miles per hour for 30 minutes and at 48 miles per hour for 45 minutes. How far did he travel?

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justaguide's profile pic

justaguide | College Teacher | (Level 2) Distinguished Educator

Posted on

Johny drives at 32 miles per hour for 30 minutes and at 48 miles per hour for 45 minutes.

While he is travelling at 32 miles per hour, the distance travelled in 30 minutes is .5 * 32 = 16

While he is travelling at 48 miles per hour, the distance travelled is (3/4)* 48 = 36 miles.

So total distance travelled is 16 + 36 = 52.

He travels 52 miles in all.

hala718's profile pic

hala718 | High School Teacher | (Level 1) Educator Emeritus

Posted on

Johnny travelled at 32 mph for 30 min.

Then, he travelled at 48 mph for 45 min.

We need to find the total distance he travelled.

We notice that he travelled at two different speeds.

Then we will find the distance he travelled at each speed, then we will find the total speed.

Let the first distance be D1 and the second distance be D2

==> We know that D = speed(mph) * time (hour)

==> time = 30 min = (1/2) hour

==> D1 = 32* (1/2) =  16 miles

Now we will calculate D2.

==> D2 = speed * time

45 min = (3/4) hour

==> D2 = 48*3/4 = 36 miles.

Then, the total distance he travelled is:

D = D1 + D2 = 16 + 36 = 52 miles.

Then the total distance is 52 miles.

neela's profile pic

neela | High School Teacher | (Level 3) Valedictorian

Posted on

The distance travelled by Jhony in 30 minutes(- 1/2 hour)  with a speed of 32 mph = speed* time in hours =  (30/60)32 = 16 miles.

The distance travelled by Jhony with a speed of 48 miles for 45 minutes (45/60 hour) = speed* time in  hours = 48*(45/60) = 36 miles

So the total distance travelled by Jhony = (16+36) miles. = 52 miles

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