The speed of a motorbike decreases from 60.5 km per hour to 40.8 km per hour in 5 minutes. Find the decrease in speed in a minute. $$ \begin{array}{ll} ext { A. } 3.24 \mathrm{~km} ext { sejam } & ext { C. } 3.94 \mathrm{~km} ext { sejam } \ 3.24 \mathrm{~km} ext { per hour } & 3.94 \mathrm{~km} ext { per hour } \ ext { B. } 3.64 \mathrm{~km} ext { sejam } & ext { D. } 3.98 \mathrm{~km} ext { sejam } \ 3.64 \mathrm{~km} ext { per hour } & 3.98 \mathrm{~km} ext { per hour }\end{array} $$

Question

The speed of a motorbike decreases from 60.5 km per hour to 40.8 km per hour in 5 minutes. Find the decrease in speed in a minute. $$ \begin{array}{ll}	ext { A. } 3.24 \mathrm{~km} 	ext { sejam } & 	ext { C. } 3.94 \mathrm{~km} 	ext { sejam } \ 3.24 \mathrm{~km} 	ext { per hour } & 3.94 \mathrm{~km} 	ext { per hour } \ 	ext { B. } 3.64 \mathrm{~km} 	ext { sejam } & 	ext { D. } 3.98 \mathrm{~km} 	ext { sejam } \ 3.64 \mathrm{~km} 	ext { per hour } & 3.98 \mathrm{~km} 	ext { per hour }\end{array} $$

UpStudy AI · Accepted Answer

To determine the decrease in speed per minute, follow these steps:

1. **Calculate the total decrease in speed:**
   $$
   \text{Initial speed} = 60.5 \, \text{km/h}
   $$
   $$
   \text{Final speed} = 40.8 \, \text{km/h}
   $$
   $$
   \text{Total decrease} = 60.5 \, \text{km/h} - 40.8 \, \text{km/h} = 19.7 \, \text{km/h}
   $$

2. **Determine the decrease per minute:**
   $$
   \text{Time period} = 5 \, \text{minutes}
   $$
   $$
   \text{Decrease per minute} = \frac{19.7 \, \text{km/h}}{5 \, \text{minutes}} = 3.94 \, \text{km/h per minute}
   $$

**Answer:**  
**C. 3.94 km per hour**
The decrease in speed per minute is 3.94 km per hour.

The speed of a motorbike decreases from 60.5 km per hour to 40.8 km per hour in 5 minutes.
Find the decrease in speed in a minute.

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