AP ICET 2024 6th May 2024 Shift 1

The first step is to calculate the original speed of the bus. The bus takes 3 hours and 30 minutes to cover 280 km . To convert 30 minutes into hours, we get:$3 \text{ hours} + \frac{30}{60} \text{ hours} = 3.5 \text{ hours}$Now, the original speed of the bus is: Next, the desired time for the journey is 4 hours. To find the new speed required to complete the journey in 4 hours, we use the formula:$\text{New Speed} = \frac{280 \text{ km}}{4 \text{ hours}} = 70 \text{ km/h}$Now, the decrease in speed is: Decrease in Speed $= 80 \text{ km/h} - 70 \text{ km/h} = 10 \text{ km/h}$Thus, the speed of the bus needs to be decreased by $10 \text{ km/h}$. Therefore, the correct answer is (3) $10 \text{ km/h}$. Quick TipTo calculate speed decrease, first find the original speed and the desired speed, then subtract the two values.