Two buses are moving in opposite directions with speed of 30 km/hr and 45 km/hr respectively. Their lengths are 0.55 km and 0.45 km respectively. In what time will the slower bus cross the faster bus?

48 seconds

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36 seconds

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60 seconds

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72 seconds

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None of these

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Solution

The correct option is A
48 seconds

Relative speed = 30 + 45 = 75 km/hr (Since both buses are moving in opposite directions)

Total distance = 0.55 + 0.45 = 1 km

Time = 1/75 hr = 3600/75 seconds = 1200/25 = 240/5 = 48 seconds

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Two buses are moving in opposite directions with speed of 30 km/hr and 45 km/hr respectively. Their lengths are 0.55 km and 0.45 km respectively. In what time will the slower bus cross the faster bus?

The correct option is A 48 seconds Relative speed = 30 + 45 = 75 km/hr (Since both buses are moving in opposite directions) Total distance = 0.55 + 0.45 = 1 km Time = 1/75 hr = 3600/75 seconds = 1200/25 = 240/5 = 48 seconds

The correct option is A
48 seconds

Relative speed = 30 + 45 = 75 km/hr (Since both buses are moving in opposite directions)

Total distance = 0.55 + 0.45 = 1 km

Time = 1/75 hr = 3600/75 seconds = 1200/25 = 240/5 = 48 seconds