At 1: 30 marlon left his house to go to the beach, a distance of 7.2 miles. he rode his skateboard until 2: 15, then walked the rest of the way. he arrived at the beach at 3: 00. marlon's speed on his skateboard is 2 times his walking speed. find his speed when walking and when skateboarding

 The speed when walking = 3.2 miles per hour

The speed when skateboarding=2(3.2)=6.4 miles per hour

Step-by-step explanation:

Let x be the walking speed then his speed on skateboard be 2x.

Time taken in skateboarding = 1:30-2:15= 45 minutes=3/4 hour

Distance traveled by skating is given by :-

Time taken for walking = 2:15-3:00=45 minutes=3/4 hour

Distance traveled by walking is given by :-

Distance between house and beach = 7.2 miles

Hence, The speed when walking = 3.2 miles per hour

The speed when skateboarding=2(3.2)=6.4 miles per hour