Two bikes start 240 km apart. Moving towards each other they meet in 3 hours; in the same direction in 12 hours. Find the slower bike’s speed.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 30 km/h.
Let speed of slower bike = x km/h, faster bike = y km/h
Distance = Speed × Time
Moving towards each other: x + y = 240 ÷ 3
x + y = 80
Moving in the same direction: y - x = 240 ÷ 12
y - x = 20
subtract both equations:
(x + y) - (y - x) = 80 - 20
2x = 60
x = 30 km/h