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A and B set out from ab at the same time. A rode a bicycle and B rode a motorcycle. They drove along the same road at an average speed. It is known that their speed ratio is 2:5 Meet 10.5 meters from the midpoint 1. How many meters is the distance between a and B? 2. If B arrives at a after 21 minutes, find the speed of a and B
10.5 kilometers
1. (10.5 + 10.5) / (5-2) × (5 + 2) = 49km
2. The speed of B is 49 △ 2 + 5 × 2 △ 21 = 2 / 3 km / min = 40 km / h
The speed of a is 40 △ 5 × 2 = 16 km / h
A and B set out from a and B at the same time. A rode a bicycle and B rode a motorcycle. They drove at a constant speed along the same route. It is known that their speed ratio is 2:5, and they met at a distance of 10.5 kilometers from the midpoint of the two places. How many kilometers are there between a and B? If B arrives at a in 21 minutes after meeting, what are the speed of bicycle and motorcycle?
(1) If the distance between a and B is divided into 7 equal parts, then a will walk 2 equal parts, and B will walk 5 equal parts; if they meet at 10.5km away from the midpoint of the two places, then B will walk 10.5 × 2 = 21 (km), and B will walk 3 equal parts more than a, so each equal part is 21 △ 3 = 7 (km), so the distance between a and B is 7 × 7 = 49 (km)
A and B start from a and B at the same time and travel in opposite directions. A travels 15 kilometers per hour by bike, which is one fifth of the speed of B's motorcycle. After two hours, a bicycle travels 15 kilometers per hour
My brother's calculation is as follows: (15 × 5 + 15) × 2 = 180 km, right or wrong?
After two hours of meeting, how many kilometers are there between a and B?
Yes, 15 × 5 is the speed of B's motorcycle. The sum of the two speeds multiplied by the time represents the distance that two people walk together
A and B set out from a and B at the same time. A rode a bicycle and B rode a motorcycle. They drove at a constant speed along the same route. It is known that their speed ratio is 2:5, and they met at a distance of 10.5 kilometers from the midpoint of the two places. How many kilometers are there between a and B? If B arrives at a in 21 minutes after meeting, what are the speed of bicycle and motorcycle?
(1) If the distance between a and B is divided into 7 equal parts, then a will walk 2 equal parts, and B will walk 5 equal parts; if they meet at 10.5km away from the midpoint of the two places, then B will walk 10.5 × 2 = 21 (km), and B will walk 3 equal parts more than a, so each equal part is 21 △ 3 = 7 (km), so the distance between a and B is 7 × 7 = 49 (km)
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