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Math's questions?
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Who can help me?1. I walked for 2 hour and ran for 3 hours. I can run twice as fast as i Walk. If i have travelled 32 km, find my walking speed.2. A and B started walking at the same time from two placed 45 km apart. A's speed was 1 km/h more than B's speed. It they walked 5 hours to meet each... 顯示更多 Who can help me? 1. I walked for 2 hour and ran for 3 hours. I can run twice as fast as i Walk. If i have travelled 32 km, find my walking speed. 2. A and B started walking at the same time from two placed 45 km apart. A's speed was 1 km/h more than B's speed. It they walked 5 hours to meet each other, find their speeds. 3.A car and Aa lorry start at the same time and in the same direction. Teh car's speed is twice that of the lorry. If the car travels 98 km more than the lorry after 3 hours, find their speeds. 4. The sum of two consecutive enen numbers is 26, What is the smaller number?
1) Let the walking speed be x km/h , then the running speed be 2x km/h By distance=speed*time 32=2x+3(2x) 8x=32 x=4 So , the walking speed is 4 km/h 2) Let the speed of A be x km/h , then that of B be (x-1) km/h 5x+5(x-1)=45 x+x-1=9 2x=10 x=5 A's speed is 5 km/h and B's speed is 4 km/h 3) Let the lorry's speed be x km/h and the car's speed be 2x km/h Since the car travels 98 km more than the lorry after 3 hours 2x(3)-x(3)=98 3x=98 x=98/3 The speed of the car is 196/3 km/h and that of the lorry is 98/3 km/h 4) Let the smaller number be x , then the larger number be x+2 x+(x+2)=26 2x=24 x=12 The smaller number is 12
其他解答:
Math's questions?
發問:
Who can help me?1. I walked for 2 hour and ran for 3 hours. I can run twice as fast as i Walk. If i have travelled 32 km, find my walking speed.2. A and B started walking at the same time from two placed 45 km apart. A's speed was 1 km/h more than B's speed. It they walked 5 hours to meet each... 顯示更多 Who can help me? 1. I walked for 2 hour and ran for 3 hours. I can run twice as fast as i Walk. If i have travelled 32 km, find my walking speed. 2. A and B started walking at the same time from two placed 45 km apart. A's speed was 1 km/h more than B's speed. It they walked 5 hours to meet each other, find their speeds. 3.A car and Aa lorry start at the same time and in the same direction. Teh car's speed is twice that of the lorry. If the car travels 98 km more than the lorry after 3 hours, find their speeds. 4. The sum of two consecutive enen numbers is 26, What is the smaller number?
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最佳解答:1) Let the walking speed be x km/h , then the running speed be 2x km/h By distance=speed*time 32=2x+3(2x) 8x=32 x=4 So , the walking speed is 4 km/h 2) Let the speed of A be x km/h , then that of B be (x-1) km/h 5x+5(x-1)=45 x+x-1=9 2x=10 x=5 A's speed is 5 km/h and B's speed is 4 km/h 3) Let the lorry's speed be x km/h and the car's speed be 2x km/h Since the car travels 98 km more than the lorry after 3 hours 2x(3)-x(3)=98 3x=98 x=98/3 The speed of the car is 196/3 km/h and that of the lorry is 98/3 km/h 4) Let the smaller number be x , then the larger number be x+2 x+(x+2)=26 2x=24 x=12 The smaller number is 12
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