A person takes 40 minutes more than his usual time when he covers a distance of 20 km at 5 km/h. If he covers the same distance at 8 km/h, he takes x minutes less than the usual time. What is the value of x?

50
48
54
45

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 1 : 50

SHORT TRICK:

× = 20

× = 20

(40 + x) = (20 × 60 × 3)/40 = 90

x = 90 – 40

x = 50

Detailed method:

Speed of man = 5 km/h

Distance = 20 km

As we know,

Time = Distance/Speed = 20/5 = 4 hr

Usual time = 4 hr – 40 min = 3 hr and 20 min

Second condition

Speed of man = 8 km/hr

Time = Distance /Speed = 20/8 = 2 hr 30 min

Time difference = (3 hr + 20 min) – (2 hr + 30 min) = 50 min

4 views Answered 2022-09-04 04:29

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