A motorcycle is moving at the speed of 25 km/hr and its speed is increased by 7 km/hr at the end of each hour. How much time it will take to cover a distance of 225 km?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 11/2 hr.
| Understanding/Application |
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Total distance = 225 km Distance travelled in every hour will be equal to the speed. Distance travelled in 1st hour = 25 km Distance travelled in 2nd hour = 32 km (Speed increased by 7 km/hour) Distance travelled in 3rd hour = 39 km Distance travelled in 4th hour = 46 km Distance travelled in 5th hour = 53 km Total distance travelled in 5 hours = 25 + 32 + 39 + 46 + 53 = 195 km Remaining distance = 225 -195 = 30 km Speed for 6th hour will be 53 + 7 = 60 km/hr 30 km can be travelled in 0.5 hours. |
| Therefore, 225 km distance will be travelled in 5.5 hours = 11/2 hr |