Answer:
See Explanation
Step-by-step explanation:
The question is straightforward; however, some important details are missing.
The missing details are: N and RHR
To solve this question, we will make assumptions for N and RHR
Represent the target heart rate with THR.
So, the steps are:
Step 1: N * 0.6 = (1)
Step 2: (1) + RHR
Step 3: THR = 2
Hence, the equation to solve THR is:

Assume the values of N and RHR are: 50 and 60 respectively
The equation becomes



Hence, the target heart rate for N = 50 and RHR = 60 is: 90